Question

Explain why the size of isoelectronic species decreases with the increase in atomic number

Answer 1

bcos ionic radius increases means atomic number is less. the size of isoelectronic species depends on nuclear charge. as the nuclear attractions increases the electrons are strongly bound to nucleas.
In F- ion no.of electrons are more than that of protons
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Answer 2

The size of isoelectronic species decreases with the increase in atomic number due to increase in effective nuclear charge.

Explanation:

Isoelectronic molecules are defined as the molecules which have the same electronic structure and have the same number of valence electrons.

As the number of electrons is same, with an increase in the atomic number of elements, the number of protons increases and the effective nuclear charge increases.

With increase in effective nuclear charge, the electrons are more tightly held by the nucleus and thus the atomic size decreases.

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