Respuesta :

Answer:

18 electrons

Explanations

Shells of an element are denoted using letters K, L, M N, O, P... The expression for calculating the number of electrons in the shell of an element is expressed as:

[tex]e=2n^2[/tex]

where:

n is the number of shells

Given the following parameters:

n = 3

Substitute the given value of "n" into the formula to have:

[tex]\begin{gathered} e=2(3)^2 \\ e=2(9) \\ e=18 \end{gathered}[/tex]

Hence the maximum number of electrons that may be placed in the third shell is 18 electrons

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