How many protons does calcium-39 have?

Answer 1

The number of protons in an element will be the same regardless of the isotope or ion. To have a different number of protons would change what type of element it is. So, it is not necessary to say "how many protons does calcium-41 have?" because it is the same as saying "how many protons does calcium have?" The answer is the same in any case, the same as the atomic number, 20.

Answer 2

The number of protons in an element will be the same regardless of the isotope or ion. To have a different number of protons would change what type of element it is. So, it is not necessary to say "how many protons does calcium-41 have?" because it is the same as saying "how many protons does calcium have?" The answer is the same in any case, the same as the atomic number, 20.

Answer 3

If it's calcium it can't have any other number of protons than 20. Number of protons is identity of an element. If the number of protons was different, it wouldn't be calcium anymore.

Answer 4

Calcium is a metal element. There are 20 electrons in a single atom.

Answer 5

An atom's atomic number gives its number of protons. Calcium's atomic number is 20. Therefore, calcium has 20 protons, regardless of isotope.

Answer 6

21

Answer 7

20.

Answer 8

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