How many Shells are in atom ?
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Answer:
A carbon atom has six electrons. It has two in the first shell and four in the second shell. A calcium atom has 20 electrons. Two are in the first shell, eight in the second shell, eight in the third shell, and two in the fourth shell
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Answer:
It depends.
Explanation:
The number of electrons contained in an atom decides its number of shells. For example, an atom having 1 or 2 electrons will have 1 shell, while an atom having 5 electrons will have 2 shells.
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