Which element of $3 r d$ period has biggest atomic size?

Chlorine

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Sodium

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Silicon

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Neon

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Solution

The correct option is D Sodium
Atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius.
Considering this trend Sodium is having a highest atomic radius in $3^{r d}$ period.

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Similar questions

The atomic number of an element is 20. In the modern periodic table, this element is placed in :

(a) 2nd period (b) 4th period (c) 3rd period (d) 1st period

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