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Daniel [21]
3 years ago
9

How many neutrons does calcium have? .20. 60. 79. 40

Chemistry
1 answer:
soldi70 [24.7K]3 years ago
4 0

Answer:

20

Explanation:

Atomic number/proton number = 20 (protons in nucleus)

Atomic mass number = 40 (protons + neutrons in nucleus)

40 - 20 = 20

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