Question

The first three elements, Na, Mg and Al, are metals. Describe the structure of a typical metal

Answer 1

Answer:

(a) Al has the highest valency of 3. As it belongs to group IIIA, it has 3 electrons in its valence shell. So, its valency is 3.

(b) Na has the largest atomic radius as the atomic radius decreases across the period.

(c) As we move from left to right in a period the chemical reactivity of a metal decreases and of non-metal increases. Here given are metals and hence Na is most reactive as it is the first element of period 3.