Question

show that the set D of all integers form a commutative group with respect to the composition*defined by a*b =a+b-1for all a,b in D​

Answer 1

Step-by-step explanation:

Atomic number (Z)=15=P→[Ne]3s

2

3p

3

Phosphorus belongs to 15th group

number of valence electrons 3s

2

3p

3

=5

and valency =3 in ground state.

Hence, the correct option is C