Question

If number of electrons in an atom is 8 and number of protons is also 8, then (i) what is the atomic number of the atom? and (ii) what is the charge on the atom?

NCERT Class IX
Sciences - Exemplar Problems

Chapter 4. Structure of the Atom

Answer 1

Atomic number:
The number of protons in one atom of an element is known as atomic number of that element.

Atomic number of an element= number of protons in one atom of element

Atomic number of an element is equal to the number of electrons in a neutral atom of that element

The atomic number of an element tells us 2 things:
1. It tells us the number of protons in one atom of the element.
2. It tells us the number of electrons in 1 normal atom of the element.


The atomic number of an element is denoted by the letter Z.
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Solution:

I)
This atom contains 8 protons so the atomic number is 8 because atomic number is equal to the number of proton in one atom.

ii)
The charge on this atom is zero because this atom contains an equal number of positive recharge protons and negative recharge electrons ( 8 each) so it has no overall charge.

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Hope this will help you... .

Answer 2

Atomic number=Number of protons=8

Charge=0 (because number of electrons is equal to the number of protons)

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