How many electrons are contained in the atom 6li?

3 electrons

Explanation:

Lithium is the third element of the periodic table, so its atomic number is 3:

Z = 3

This means that an atom of lithium contains 3 protons. Moreover, for a neutral atom the number of protons in the nucleus is equal to the number of electrons: this means that an atom of lithium contains 3 electrons as well.

In this specific case, we have an isotope of Lithium-6 (6Li), which has a mass number of 6:

A = 6

This means that the atom contains 6 protons+neutrons in the nucleus, so it contains 6-3 = 3 neutrons.

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