Question

Na, Mg and Al are the elements of the 3rd period of the Modern Periodic Table Table having group number 1,2 and 13 respectively. Which one of these elements has the (a) highest valency, (b) largest atomic radius, and (c) maximum chemical reactivity?justify

Answer 1

a)al
b)Na
c)mg
I these are the following answers for your question

Answer 2

(i) Al has the highest valency

because in the outer most shell it

has 3 electron but Na has 1 and

Mg has 2.

(ii) Na has the largest atomic radius because if Na lose the electron to gain Nobel gas congregation the charge of the nucleus charge increases and electron charge decreases so nucleus won't put too much force to catch the electron.

(iii) Na have maximum chemical reactivity because reactivity decreases on moving left to right in the period and Na is on first in the 3rd period.

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