Which of the following elements has the smallest atomic radius in Group 1?
A. Sodium
B. Lithium
C. Cesium
D. Potassium
Answer: Option B
Solution (By JKSSB Mock Tests)
Atomic radius increases down a group due to addition of shells. Lithium (Z=3, 2 shells) is the first element in Group 1 and has the smallest radius. Cesium has the largest. The effective nuclear charge also plays a role, but shell number dominates. Trend: Li < Na < K < Rb < Cs.
Explanation:
Salivary amylase (ptyalin) hydrolyzes starch into maltose in the mouth. Pepsin digests protein in stomach; lipase digests fats; trypsin is pancreatic enzyme for proteins.
Explanation:
Fajan's rules state that covalent character in an ionic bond increases with greater polarizing power of the cation and greater polarizability of the anion. A small cation has high charge density (high polarizing power), and a large anion has loosely held outer electrons (high polarizability), favoring covalency.
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