Question

Chlorine is an element with atomic number of 17. A chlorine atom has a mass number of 35. What is the number of neutrons in this atom?

Answer 1

Explanation:

the atomic mass of chlorine (Cl) is 35.45 amu because chlorine is composed of several isotopes, some (the majority) with an atomic mass of 35 amu (17 protons and 18 neutrons) and some with an atomic mass of 37 amu (17 protons and 20 neutrons).

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Answer 2

Given:-

No. of protons=Atomic Number=17

Atomic mass=35

To find:-

No. of neutrons.

Proof:-

Atomic mass/Mass number=Number of protons+No. of neutrons

35 =17+no.of neutrons

35-17=No.of neutrons

18 is the no. of neutrons.

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