We know that only valence electrons take part in bond formation with different atoms. In the atom of ‘X’ element there are only two electrons. Since atomic number is 2. Thus, K shell is fully filled for this atom. Hence, its valency is zero. It will not other atoms of different elements.
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💡 Some Related Questions
Complete the following gaps in the given table:
Elements | Protons | Electrons | Neutrons | Atomic Number | Mass Number |
A | – | – | 10 | 8 | – |
B | 15 | – | – | – | 31 |
C | 1 | – | – | – | 3 |
D | – | 11 | 12 | – | – |
Composition of the nuclei of two atomic species ‘X’ and ‘Y’ are given below:
X | Y | |
Protons | 8 | 8 |
Neutrons | 8 | 10 |