#17
#a
Group 15 elements have valency 3
#b
Let's check the EC of both
[tex]\\ \rm\Rrightarrow [O]=1s^22s^22p^4[/tex]
[tex]\\ \rm\Rrightarrow [S]=[Ne]3s^23p^4[/tex]
- Oxygen is smaller in size
- Hence more electronegative.
#c
Decrease in size
- Farther we go in a period more electrons are added to the atom .So nuclear charge increases and atomic radius decreases
#18
#a
#b
- Nitric acid is a acid so methyl orange turns red
#c
