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What is the mass number of an isand that has 68 neutrons?

What Is The Mass Number Of An Isand That Has 68 Neutrons class=

Sagot :

Answer

129

Explanation

Mass number is the total or sum of number of protons and neutrons (together known as nucleons) in an atomic nucleus.

The atomic number is the number of protons in an atom.

Mass number = number of protons + number of neutrons

Number of protons = atomic number = 61

Number of neutrons = 68

Therefore, the mass number of the element = 61 + 68 = 129 u

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