Mass number = No. of protons + No. of neutrons = 31
∴ Number of neutrons = 31 – Number of protons
= 31 – 15 = 16
Mass number = No. of protons + No. of neutrons = 31
∴ Number of neutrons = 31 – Number of protons
= 31 – 15 = 16
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Elements | Protons | Electrons | Neutrons | Atomic Number | Mass Number |
A | – | – | 10 | 8 | – |
B | 15 | – | – | – | 31 |
C | 1 | – | – | – | 3 |
D | – | 11 | 12 | – | – |
X | Y | |
Protons | 8 | 8 |
Neutrons | 8 | 10 |