Question

1) The order of decreasing atomic size is :
(a) Na Mg < Al < Si
(c) Mg < Na < Al < Si
(b) Na > Mg.> AIS Si
(d) Mg > Na > Al > Si​

Answer 1

Explanation:

Hence Na>mg>Al>Is correct order.

Answer 2

Answer:

option A

in groups going down topto bottom number of shells increases so atomic size increases