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A lithium atom has an atomic number of 3 and a mass of 7. The number of electrons which it has in the 1st shell (principal energy level) is ?

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On the first shell it has 2 electrons. On it’s second shell it has 1.
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The number of electrons that it has in the 1st shell i.e. the principal energy level is 2.

Lithium is the third (3) element on the periodic table. It can be seen in group 1 and period 2 on the periodic table. It is a group 1 alkali metal that forms an electrovalent bond with atoms in group 7.

In the energy level, the maximum number of electrons that can be occupied in the 1st shell is given by the formula 2n².

where;

  • n = number of shell

For the 1 shell, the maximum number of electrons is:

=2(1)²

= 2

Learn more about energy levels here:

https://brainly.com/question/17396431?referrer=searchResults

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