Question

Calculate the atomic number of element whose atomic nucleus has mass number 23 and neutron number 12. What is atomic number and name for their element

Answer 1

Total mass of atom = mass of proton + mass of neutron.

here, total mass= 23
mass of neutron= 12
Therefore, atomic number of element is 11, Sodium.

Answer 2

The atomic number of element is 11 and it is Sodium.

Explanation:

Given that,

Mass number of an element is 23

Neutron number is 12.

We know that, total mass of atom is equal to the sum of number of protons and the number of neutron.  

23 = 12 +number of proton

Number of proton = 23 - 12 =11

Atomic number is equal to the number of protons. So, the atomic number of element is 11 and it is Sodium.

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Atomic number

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