<em>Answer:</em> an anion will form with -3 charge.
<em>Explanation;</em>
The atomic number of the given atom = 15
Atomic number = number of protons
The number of protons of the given atom = 15
The atomic mass of the given atom = 31
Atomic mass = number of protons + number of neutrons
Hence,
number of neutrons = atomic mass - number of protons
= 31 - 15
= 16
Since, the atomic number is 15, the given atom is P which has the atomic number as 15.
In the neutral compound,
number of protons = number of electrons
Hence,
the number of electrons of the neutral atom = 15
But, the atom has gained 3 electrons.
Gaining of electrons will form anions.
Hence, the atom will be converted into anion which has -3 charge on it.
But the atomic mass, atomic number, number of protons and number of electrons will not be changed
