Mass No. | Atomic No. | No. of protons | No. of electrons | No. of neutron | Electronic configuration | No. of valence electrons | ||||
K | L | M | N | |||||||
12 | 6 | - | - | - | - | - | - | - | - | |
40 | 20 | - | - | - | - | - | - | - | - | |
Answer:
Mass No.
Atomic No.
No. of protons
No. of electrons
No.
of neutron
Electronic configuration
No. of valence elctrons
K
L
M
N
12
6
6
6
6
2
4
-
-
4
40
20
20
20
20
2
8
8
2
2
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