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  4. The effective nuclear charge of an element with three valence electrons is 2.60. What is the atomic number of the element?

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Q. The effective nuclear charge of an element with three valence electrons is $2.60.$ What is the atomic number of the element?

KEAMKEAM 2018Some Basic Concepts of Chemistry

Solution:

$\because$ Effective nuclear charge $=2.60$

and valency shell contain 3 electrons.

Thus, minimum number of main shells for the given element are two i.e $(n=2)$ and its configuration will be $1 s^{2}, 2 s^{2} 2 p^{1}$.

Thus, the given element has 5 electrons in all. Also, for a neutral atom.

$\because$ No. of electrons $=$ Atomic number

Thus, atomic number of the element is $5 .$