Question

why the atomic size of the element decreases across the period as the atomic number increases?​

Answer 1

Answer:

The atomic no. increases the magnitude of nuclear attraction. Thus the size of element decrease across the period as the atomic no. increases because the outermost shell get attracted.

Answer 2

As we go from left to right in a period, the atomic size or atomic radius increases with increase in atomic number. Increase in atomic number leads to an increase in the number of protons and electrons in the atoms.Due to the large nuclear charge (positive charge on the nucleus), the electrons are pulled in more close to the nucleus and the size of atom decreases.

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