Atomic no.of P is 15. What is its electronic configuration?
2,6,6,1
2,8,2,3
2,8,5
8,7
How many electrons are present in the valence shell of sulphur?
2
6
5
7
Which one is more electronegative?
Ca
O
N
F
Which one of the following is an electron deficient compound?
CH4
H2O
BF3
HF
How many C-H covalent bonds are present in methane molecule?
3
4
Which one of the following is smallest in size?
Na
Na+
K
Br-
How many lone pairs are present in oxygen in the H2O molecule
1
0
How many electrons are present in Mg2+ ion?
10
11
12
8
The chemical interaction that binds Na+ and CI- in NaCI molecule is
Covalent bond
Hydrogen bond
ionic bond
Metallic bond
Which is the donor atom in sulphur trioxide?
S
H
None of these