Question

18) Thee radius of Na+ cation is less than that of Na atom .Give reason.
19) Why non metals do not displace hydrogen from dilute acids?​

Answer 1

Explanation:

18) In Na+ number electron decrease , so the effectiveness of nuclear attractive force increases. so the radius outermost orbital decrease so the size or Na+ decrease then Na.

19) Most of the non metals are electronegetive in nature, so they tendency to gain electrons in the chemical reactions. therefor they are less reactive than hydrogen. so they are not able to displaced hydrogen form dilute acids