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The first ionisation potential of Na, Mg, Al and Si are in the order(a) Na <Mg>AI< Si(b) Na > Mg > AI>Si(c) Na< Mg<AI>Si(d) Na > Mg > Al<Si |
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Answer» Correct option (a) Na <Mg>AI< Si Explanation: First ionisation potential increases from left to right across a period but Mg has extra stability than Al, due to full-filled 3s -orbitals. Na11 = 1s2,2s2,2p6,3s1 Mg12 = 1s2,2s2,2p6,3s2 AI13 = 1s2,2s2,2p6,3s2, 3p1 Si14 = 1s2,2s2,2p6,3s2, 3p2 Thus, correct order of first ionisation potential is : Na<Mg>AL<Si |
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