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What does the -40, -42, -43, -44, -46,-48 mean for each isotope of Calcium?

What does the -40, -42, -43, -44, -46,-48 mean for each isotope of Calcium?
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What does the -40, -42, -43, -44, -46,-48 mean for each isotope of Calcium?

User Thebringking
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mass number of calcium isotopes

mass numberi the number of proton + neutron

number of proton for calcium is 20 regardless of isotopes

hence the only difference between calcium isotopes are rhe number of neutron
User Myyk
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