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The effective nuclear charge of an eleme...

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

A

1

B

2

C

3

D

5

Text Solution

Verified by Experts

The correct Answer is:
D
`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 `1s^(2), 2s^(2) 2p^(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.
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