Question

Which one has the smaller size?
K (19) or Na (1); B (5) or C (6)

Answer 1

Answer:

c(6)

explanation:

carbon comes extreme right to table

Answer 2

Sodium (Na)

Carbon (C)

Explanation:

As you move down an element group in the periodic table, the atomic radius increases. So the atomic size increases as we move from up to down of a group. So Potassium (K) has a bigger atom size when compared to Sodium (Na) which is above it on the periodic table.

As you move left to right of a period in the periodic table, the atomic radius decreases. So the atomic size decreases as we move towards to the right of a period. So Boron (B) has a bigger atom size when compared to Carbon (C) which is towards the right of the period.