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The model below shows a calcium atom.
How many electrons are in the third energy level?
O 2
O 8
O 18
O 20
og

Respuesta :

raduoprea160

first energy level:1s2=2 electrons

2nd energy level:2s2 2p6=8 electrons

3rd energy level 3s2 3p6=8 electrons

Yisrael777

Answer:

B.8

Explanation:

Ca=20

K L M N

2 8 8 2

The third energy level of an atom (with atomic number 20 and above) contains 8 electrons.

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