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Setler79 [48]
2 years ago
10

The shielding of electrons gives rise to an effective nuclear charge, Zeff, which explains why boron is larger than oxygen. Esti

mate the approximate Zeff felt by a valence electron of boron and oxygen, respectively?
A. +5 and +8
B. +3 and +6
C. +5 and +6
D. +3 and +8
E. +1 and +4
Chemistry
1 answer:
Paul [167]2 years ago
3 0

Answer:

Option B. +3 and +6

Explanation:

<em>Zeff</em> = <em>z - s</em>

where <em>z</em> is the atomic number, <em>s</em> is the number of shielding(non-valence) electrons

For Boron, electronic configuration is 1s²2s³.

z = 5, s = 2

Zeff = 5 - 2 = +3

For Oxygen, electronic configuration is 1s²2s²2p⁴

z = 8, s = 2

Zeff = 8 - 2 = +6

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<h3>What is Atomic mass? </h3>

Atomic mass is defined as the whole mass of an atom.

It is also defined as the sum of atomic number and number of neutrons.

Atomic mass = Atomic number + neutrons

<h3>What is Isotopes?</h3>

Isotopes are the those element which have same atomic number but have different mass number and number of neutrons.

The average relative atomic mass can be calculated as

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