| Elements | Protons | Electrons | Neutrons | Atomic number | Mass number |
| A | - | - | 10 | 8 | - |
| B | 15 | - | - | - | 31 |
| C | 1 | - | - | - | 3 |
| D | - | 11 | 12 | - | - |
Answer:
We know that the number of protons = Atomic number
Number of protons = Number of electrons [in atom]
Mass number = number of protons + number of neutrons
Using these relationships, we can fill up these gaps as follows.
Elements
Protons
Electrons
Neutrons
Atomic number
Mass number
A
8
8
10
8
18
B
15
15
16
15
31
C
1
1
2
1
3
D
11
11
12
11
23
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