Question

third shell of an atom is represented with​

Answer 1

Answer:

2n^2 where n is any shell of an atom

2(3)^2=2×9=18

Step-by-step explanation:

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Answer 2

An atom is a fundamental piece of matter. An atom itself is made up of three tiny kinds of particals called subatomic particals : protons , neutrons and electrons .The protons and the neutrons make up the center of the atom called nucleus and the electrons fly around above the nucleus in a small cloud.