# What is the mass number of the isotope lithium 7

Posted By Admin @ September 03, 2022

#### Question:

What is the mass number of the isotope lithium-7? Lithium has 3 protons. How many neutrons are in the isotope lithium-8?

The isotope of Lithium-7 has a mass number of 7. And the isotope of Lithium-8 has 5 neutrons.

Given data:

The number of protons in a lithium-7 isotope is, 3.

The mass number of an element is equal to  to the number of protons inside its nucleus. Mathematically,

Mass number = number of protons + number of neutrons

Mass number of Lithium-7:

The nomenclature of  "Element-X", where X is an abbreviation to indicate the mass number of the isotope.

Therefore, an isotope of Lithium-7 has a mass number of 7.

Number of neutrons in an isotope of lithium-8:

Lithium-8 has the mass number of 8. And we know that,

Mass number = number of protons + number of neutrons

Lithium is the third element of the periodic table, so its atomic number is 3, which means that it has 3 protons.

Then,

8 = 3 + number of neutrons

number of neutrons = 8 - 3

number of neutrons = 5

Therefore, an isotope of Lithium-8 has 5 neutrons.

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