Question 11
1 pts
If a calcium atom has 20 protons, 21 neutrons, and 20 electrons, what is it...
Chemistry, 21.09.2020 02:01, wolfgirl4762
Question 11
1 pts
If a calcium atom has 20 protons, 21 neutrons, and 20 electrons, what is its atomic
number?
40
0 21
O 20
41
Answers: 2
Chemistry, 22.06.2019 01:00, mutoni55
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Answers: 2
Chemistry, 22.06.2019 23:00, genyjoannerubiera
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Answers: 3
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