Question

Q1. The valence electrons in Beryllium (atomic no= 4) experience lower net attraction to the nucleus compared to those of Oxygen (atomic no= 8) though both the atoms have same number of shells. Explain.​

Answer 1

Answer:

Due to screening caused by electrons.

Explanation:

The net attraction to the nucleus depends upon the shell number as well as the number of electrons.

The effective nuclear charge on an electron depends upon number of electrons in the shell as well as they cause screening of the the electron.

The number of electrons are more in the oxygen as compared to beryllium thus the electrons of oxygen experience more shielding and as compared to beryllium and thus the net attraction to electrons in beryllium is less.

The electronic configuration are:

Oxygen = $1s^{2}2s^{2}$

Beryllium =$1s^{2}2s^{2}2p^{4}$

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The valence electrons in beryllium experience lower net attraction to the nucleus.

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Answer 2

Answer:

Explanation:

Atomic number of Beryllium = 4

Electronic configuration = (2, 2)

Atomic number of Oxygen = 8

Electronic configuration = (2, 6)

Valency of Beryllium is 2,

Valency of Oxygen is = 8 ‒ 6 = 2