One radioactive isotope of calcium has an atomic mass of 47. how many protons are in this calcium-47 nucleus? a) 17 b) 20 c) 27 d) 47

B) 20

Explanation: Atomic number is equal to the number of electrons or the number of protons for a neutral atom.

Mass number is the sum of number of protons and the number of neutrons.

Mass number = Number of protons + Number of neutrons = 47

General representation of an element is given as: where,

Z represents Atomic number

A represents Mass number

X represents the symbol of an element

Calcium has atomic number of 20. For the given isotope of calcium,

Thus number of protons = 20.

b

explanation:

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