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Number of neutrons = mass number - atomic number = 40 - 20 = 20 neutrons

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11y ago
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13y ago

20 protons and 20 neutrons

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13y ago

40 protons ,20 electrons and 20 neutrons

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14y ago

Calcium-44 has 24 neutrons.

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15y ago

20 neutrons

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Q: How many neutrons does calcium-40 have?
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