A single atom of an element has 21 neutrons, 20 electrons, and 20 protons, which elementis it?

asked Apr 5, 2021 44.3k views

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3 votes

Answer:

Calcium

Step-by-step explanation:

The number of protons is the atomic number of the element. Number 20 on the periodic table is Calcium.

Carren answered Apr 9, 2021

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