Beginner-friendly Pre-med/IB-style questions on periodic table group properties (Group 1, 2, 17, 18), how groups react with each other (especially metals + halogens, halogen displacement), and using the metal reactivity series to predict reactions, extraction, and corrosion protection.
Elements in the same group (column) of the periodic table tend to have similar chemical properties mainly because they have the same number of:
Source: entermedschool.org
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src="https://entermedschool.org/embed/questions#{"title":"Group Properties & Reactivity Series","questions":[{"prompt":"Elements in the same group (column) of the periodic table tend to have similar chemical properties mainly because they have the same number of:","options":[{"label":"A","body":"Protons","isCorrect":false},{"label":"B","body":"Neutrons","isCorrect":false},{"label":"C","body":"Electron shells","isCorrect":false},{"label":"D","body":"Valence (outer-shell) electrons","isCorrect":true},{"label":"E","body":"Isotopes","isCorrect":false}],"explanation":"Chemical behavior is largely determined by valence electrons (the electrons involved in bonding). Same group → same valence electron count → similar bonding patterns and typical ion charges."},{"prompt":"Which list contains ONLY alkali metals (Group 1)?","options":[{"label":"A","body":"Li, Na, K","isCorrect":true},{"label":"B","body":"Mg, Ca, Sr","isCorrect":false},{"label":"C","body":"F, Cl, Br","isCorrect":false},{"label":"D","body":"He, Ne, Ar","isCorrect":false},{"label":"E","body":"Fe, Co, Ni","isCorrect":false}],"explanation":"Alkali metals are Group 1 (Li, Na, K, Rb, Cs, Fr). Group 2 are alkaline earth metals, Group 17 are halogens, Group 18 are noble gases, and Fe/Co/Ni are transition metals."},{"prompt":"An element in Group 17 (a halogen) most commonly forms which ion in ionic compounds?","options":[{"label":"A","body":"1+","isCorrect":false},{"label":"B","body":"2+","isCorrect":false},{"label":"C","body":"3+","isCorrect":false},{"label":"D","body":"1−","isCorrect":true},{"label":"E","body":"2−","isCorrect":false}],"explanation":"Halogens have 7 valence electrons and typically gain 1 electron to reach a full outer shell, forming 1− ions (e.g., Cl−, Br−)."},{"prompt":"An element in Group 2 most commonly forms which ion in ionic compounds?","options":[{"label":"A","body":"1+","isCorrect":false},{"label":"B","body":"2+","isCorrect":true},{"label":"C","body":"3+","isCorrect":false},{"label":"D","body":"1−","isCorrect":false},{"label":"E","body":"2−","isCorrect":false}],"explanation":"Group 2 metals have 2 valence electrons and typically lose both to reach a noble-gas-like configuration, forming 2+ ions (e.g., Mg2+, Ca2+)."},{"prompt":"Which statement best compares Group 1 metals with Group 2 metals in the same period?","options":[{"label":"A","body":"Group 2 metals form 1+ ions; Group 1 metals form 2+ ions","isCorrect":false},{"label":"B","body":"Group 1 metals are generally more reactive and form 1+ ions; Group 2 metals are less reactive and form 2+ ions","isCorrect":true},{"label":"C","body":"Group 1 metals are nonmetals; Group 2 metals are noble gases","isCorrect":false},{"label":"D","body":"Group 1 metals tend to gain electrons; Group 2 metals tend to gain electrons","isCorrect":false},{"label":"E","body":"Group 2 metals are always more reactive than Group 1 metals","isCorrect":false}],"explanation":"Group 1 metals lose 1 electron easily (forming 1+), making them very reactive. Group 2 metals lose 2 electrons (forming 2+), which generally requires more energy, so they’re typically less reactive than Group 1 metals in the same period."},{"prompt":"Alkali metals are commonly stored under oil mainly to prevent them reacting with:","options":[{"label":"A","body":"Nitrogen in the air","isCorrect":false},{"label":"B","body":"Moisture (water) in the air","isCorrect":true},{"label":"C","body":"Glass containers","isCorrect":false},{"label":"D","body":"Other metals","isCorrect":false},{"label":"E","body":"Light (photons)","isCorrect":false}],"explanation":"Group 1 metals react vigorously with water, even with moisture in air. Oil blocks contact with water vapor (and also reduces contact with oxygen)."},{"prompt":"Reactivity of Group 1 metals increases down the group mainly because:","options":[{"label":"A","body":"The nucleus gets smaller","isCorrect":false},{"label":"B","body":"The outer electron is farther from the nucleus and more shielded, so it is lost more easily","isCorrect":true},{"label":"C","body":"They gain electrons more easily","isCorrect":false},{"label":"D","body":"They have fewer electron shells","isCorrect":false},{"label":"E","body":"They become less metallic","isCorrect":false}],"explanation":"Down Group 1, atomic radius and electron shielding increase. The outer electron feels a weaker pull from the nucleus, lowering ionization energy and making electron loss (and thus reactions) easier."},{"prompt":"When a Group 1 metal reacts with water, the products are generally:","options":[{"label":"A","body":"Metal chloride + oxygen gas","isCorrect":false},{"label":"B","body":"Metal hydroxide + hydrogen gas","isCorrect":true},{"label":"C","body":"Metal oxide + carbon dioxide","isCorrect":false},{"label":"D","body":"Metal nitrate + nitrogen gas","isCorrect":false},{"label":"E","body":"Metal sulfate + sulfur dioxide","isCorrect":false}],"explanation":"Group 1 metals react with water to form an alkaline solution of the metal hydroxide (MOH) and hydrogen gas (H2)."},{"prompt":"Which equation is correctly balanced for potassium reacting with water?","options":[{"label":"A","body":"K + H2O → KOH + H","isCorrect":false},{"label":"B","body":"2K + H2O → 2KOH + H2","isCorrect":false},{"label":"C","body":"2K + 2H2O → 2KOH + H2","isCorrect":true},{"label":"D","body":"K2 + 2H2O → 2KOH + H2","isCorrect":false},{"label":"E","body":"2K + H2O → K2O + H2","isCorrect":false}],"explanation":"The correct pattern is 2M + 2H2O → 2MOH + H2 for Group 1 metals. Option C balances K, H, and O atoms correctly."},{"prompt":"Why does the water become alkaline when sodium reacts with it?","options":[{"label":"A","body":"Because sodium releases H+ ions into the solution","isCorrect":false},{"label":"B","body":"Because sodium hydroxide forms, producing OH− ions in solution","isCorrect":true},{"label":"C","body":"Because hydrogen gas dissolves and makes OH− ions","isCorrect":false},{"label":"D","body":"Because sodium turns into chlorine","isCorrect":false},{"label":"E","body":"Because oxygen ions always make solutions alkaline","isCorrect":false}],"explanation":"The reaction forms sodium hydroxide (NaOH). In water, NaOH dissociates to give OH−, making the solution alkaline (high pH)."},{"prompt":"Compared with Group 1 metals, Group 2 metals generally react less vigorously with water in the same period mainly because:","options":[{"label":"A","body":"Group 2 metals are nonmetals","isCorrect":false},{"label":"B","body":"Group 2 metals must lose two electrons to form stable ions, which is generally harder than losing one","isCorrect":true},{"label":"C","body":"Group 2 metals have no valence electrons","isCorrect":false},{"label":"D","body":"Group 2 metals gain electrons instead of losing them","isCorrect":false},{"label":"E","body":"Water cannot react with 2+ ions","isCorrect":false}],"explanation":"Forming M2+ typically requires removing two electrons, which is generally less energetically favorable than removing one (as in Group 1), so Group 2 tends to be less reactive in the same period."},{"prompt":"Which Group 2 metal is expected to react most vigorously with cold water (trend down the group)?","options":[{"label":"A","body":"Be","isCorrect":false},{"label":"B","body":"Mg","isCorrect":false},{"label":"C","body":"Ca","isCorrect":false},{"label":"D","body":"Ba","isCorrect":true},{"label":"E","body":"Al","isCorrect":false}],"explanation":"Reactivity of Group 2 generally increases down the group due to increased shielding and lower ionization energies. Barium is lowest among the listed Group 2 metals. Aluminum is not Group 2."},{"prompt":"Which equation is correctly balanced for calcium reacting with water?","options":[{"label":"A","body":"Ca + H2O → CaOH + H","isCorrect":false},{"label":"B","body":"Ca + 2H2O → Ca(OH)2 + H2","isCorrect":true},{"label":"C","body":"2Ca + H2O → 2CaOH + H2","isCorrect":false},{"label":"D","body":"Ca2 + 2H2O → Ca(OH)2 + H2","isCorrect":false},{"label":"E","body":"Ca + H2O → CaO + H2","isCorrect":false}],"explanation":"Group 2 metals that react with water follow: M + 2H2O → M(OH)2 + H2. Option B is correctly balanced."},{"prompt":"Magnesium reacts very slowly with cold water but reacts more readily with steam. The main products of magnesium reacting with steam are:","options":[{"label":"A","body":"Mg(OH)2 and O2","isCorrect":false},{"label":"B","body":"MgO and H2","isCorrect":true},{"label":"C","body":"MgH2 and O2","isCorrect":false},{"label":"D","body":"MgCl2 and H2","isCorrect":false},{"label":"E","body":"MgCO3 and H2","isCorrect":false}],"explanation":"With steam (hot water vapor), magnesium forms magnesium oxide (MgO) and hydrogen gas (H2). With cold water, the reaction is much slower and can form Mg(OH)2."},{"prompt":"Halogens (Group 17) commonly exist as elemental molecules with which formula type?","options":[{"label":"A","body":"X","isCorrect":false},{"label":"B","body":"X2","isCorrect":true},{"label":"C","body":"X3","isCorrect":false},{"label":"D","body":"X4","isCorrect":false},{"label":"E","body":"X8","isCorrect":false}],"explanation":"Halogens are typically diatomic as elements (F2, Cl2, Br2, I2) because each atom needs one more electron to reach a stable outer shell and can share one pair in X–X bonding."},{"prompt":"Reactivity of halogens generally changes down Group 17 in which way?","options":[{"label":"A","body":"Increases","isCorrect":false},{"label":"B","body":"Decreases","isCorrect":true},{"label":"C","body":"Stays exactly the same","isCorrect":false},{"label":"D","body":"Becomes unpredictable with no pattern","isCorrect":false},{"label":"E","body":"Increases then decreases","isCorrect":false}],"explanation":"Halogen reactivity decreases down the group because atoms get larger and more shielded, so it becomes harder for the nucleus to attract an incoming electron."},{"prompt":"Why do halogens become less reactive down Group 17?","options":[{"label":"A","body":"They have fewer electron shells","isCorrect":false},{"label":"B","body":"They gain protons more easily","isCorrect":false},{"label":"C","body":"The attraction for an added electron decreases due to increased atomic radius and shielding","isCorrect":true},{"label":"D","body":"They stop forming covalent bonds","isCorrect":false},{"label":"E","body":"They become metals","isCorrect":false}],"explanation":"Down the group, valence electrons are further from the nucleus and inner electrons shield the nuclear charge. This weakens attraction for an incoming electron, so the oxidizing power/reactivity decreases."},{"prompt":"Which halogen is a liquid at room temperature?","options":[{"label":"A","body":"Fluorine","isCorrect":false},{"label":"B","body":"Chlorine","isCorrect":false},{"label":"C","body":"Bromine","isCorrect":true},{"label":"D","body":"Iodine","isCorrect":false},{"label":"E","body":"Neon","isCorrect":false}],"explanation":"At room temperature: F2 and Cl2 are gases, Br2 is a liquid, and I2 is a solid. Neon is a noble gas (Group 18), not a halogen."},{"prompt":"Chlorine gas is bubbled through a solution of potassium bromide (KBr). What is the key chemical change?","options":[{"label":"A","body":"No reaction occurs because bromine is more reactive than chlorine","isCorrect":false},{"label":"B","body":"Chlorine displaces bromine, forming bromine (Br2) and chloride ions","isCorrect":true},{"label":"C","body":"Bromine displaces chlorine, forming chloride (Cl−) and bromide ions","isCorrect":false},{"label":"D","body":"Potassium metal is produced","isCorrect":false},{"label":"E","body":"A precipitate of KCl forms because KCl is insoluble","isCorrect":false}],"explanation":"A more reactive halogen displaces a less reactive halide from solution. Chlorine is more reactive than bromine, so Cl2 oxidizes Br− to Br2 (often seen as an orange/brown color)."},{"prompt":"Chlorine gas is bubbled through a solution of potassium iodide (KI). Which product is formed from iodide ions?","options":[{"label":"A","body":"Cl−","isCorrect":false},{"label":"B","body":"I2","isCorrect":true},{"label":"C","body":"IO3−","isCorrect":false},{"label":"D","body":"H2","isCorrect":false},{"label":"E","body":"K metal","isCorrect":false}],"explanation":"Chlorine (more reactive) displaces iodine from iodide: Cl2 oxidizes I− to I2. The iodide ion loses electrons to become iodine molecules."}]}"
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