One atom has 11 protons and 13 neutrons. Another has 11 protons and 12 neutrons. Are they the same or different elements? Explain your answer

Both the given species are isotopes of the same element.

Explanation:

An isotope is defined as the chemical species that have the same atomic number but a different mass number.

The atom consists of 3 subatomic particles:

An atomic number is defined as the number of protons or number of electrons present in a neutral atom. It remains specific for a particular element.

Mass number is defined as the sum of the number of protons and neutrons present in the nucleus of an atom.

Given values:

For isotope 1:

Number of protons = 11 = atomic number

Number of neutrons = 13

Mass number = 11 + 13 = 24

For isotope 2:

Number of protons = 11 = atomic number

Number of neutrons = 12

Mass number = 11 + 12 = 23

As the atomic number of both the isotopes is the same. Thus, they belong to the same elements.

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