Question

what is meant by atomic number of calcium is 20

Answer 1

it's come in the periodic table 4 period and 2 group
it has valency of +2
it is used in the preparation of pop and gypsum
it has outershell orbital NS2
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by anshu jurriya 2003

Answer 2

Hey mate ✌️✌️❤️❤️
Here is ur answer ⬇️⬇️
It means that an atom of calcium contain 20 protons in its nucleus and many other things.

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Thanks (@_@)✌️✌️