The valency of an element 'Y' present in the $2^{n d}$ period of the modern periodic table is 4. What is the atomic number of the element present just below 'Y' in the periodic table?

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Solution

The correct option is D 14
The valency of an element is equal to the number of valence electrons if it contains less than or equal to four electrons in its valence shell. The valency will be the same for all elements in a group in the modern periodic table.
The element ‘Y’ is present in the 2nd period and its valency is 4. So
the element present below ‘Y’ will be in the 3rd period and its valency will be also 4. Therefore its electronic configuration is 2, 8, 4 and its atomic number is 14.

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