Question

The mass number of an atom is 31. The M shell of this atom contains 5 electron. write it's atomic number and electronic configuration.
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Answer 1

Explanation:

Another way to refer to a specific atom is to write the mass number of the atom after the name, separated by a hyphen. Symbol-mass format for the above atom …

Answer 2

Answer:

The mass number of the atom is 31. We know that mass number = number of protons + number of neutrons. The M shell of this atom contains 5 electrons. Hence, the total number of electrons is 15.