Question

27) Fluorine with atomic number 9 and sodium with atomic number 11 are present in different periods and groups of the periodic table, but
both show a valency as one Explain​

Answer 1

Answer:-

In Fluorine case:-

$\star$ Fluorine has the atomic number 9.

$\star$ ELECTRONIC CONFIGURATION of Fluorine will be (2,7).

$\star$ According to octet rule it's valency is 8-7=1.

In Sodium case:-

$\star$ Sodium has the atomic number 11.

$\star$ ELECTRONIC CONFIGURATION of Sodium will be (2,8,1)

$\star$ According to octet rule it's valency is 1.

Hence verified.