Among H, Li, O and F, ____ element has the largest atom and ____ the smallest atom.
Li, H
Atomic size increases down a group as new shells are added and decreases across a period from left to right as the rising nuclear charge pulls the electrons closer.
Hydrogen (Z = 1) has its only electron in the first shell (1s1), so it is the smallest of the four atoms.
Li (Z = 3), O (Z = 8) and F (Z = 9) all lie in period 2. Lithium is at the left end of the period with the smallest nuclear charge, so it has the largest radius; oxygen and fluorine are smaller than lithium.
Hence, Li, H.
Note: RRB did not award marks for this question in the official key.
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