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.

Learn more about the mass number here:

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1. Mass number of Lithium-7: 7

Explanation:

- The atomic number of an element is equal to the number of protons inside its nucleus

- The mass number of an element is equal to the number of protons+neutrons inside its nucleus

The nomenclature "Element-X", where X is the number of protons+neutrons, is used to indicate the mass number of the isotope. Therefore, an isotope of LIthium-7 has a mass number of 7.

2. An isotope of lithium-8 contains 5 neutrons

Explanation:

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

In this problem, we have an isotope of lithium-8, which means that it has a mass number of 8: so, the sum of neutrons+protons in its nucleus is 8:

where p is the number of protons and n the number of neutrons. However, we also know that for lithium p=3, so we can find the number of neutrons:

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