Give the number of protons, electrons, and neutrons in neutral atoms of each of the following isotopes:
(a) 7,3 li
(b) 125,52 te
(c) 109,47 ag
(d) 15,7 n
(e) 31,15 p

(a) 7,3 Li: 3 protons, 3 electrons, 4 neutrons.

(b) 125,52 Te: 52 protons, 52 electrons, 73 neutrons.

(c) 109,47 Ag: 47 protons, 47 electrons, 62 neutrons.

(d) 15,7 N: 7 protons, 7 electrons, 8 neutrons.

(e) 31,15 P: 15 protons, 15 electrons, 16 neutrons.

Explanation:

In the case of the isotopes in neutral atoms, the number of electrons and protons is equal to the atomic number, the number of neutrons is equal to the number of the isotope minus the atomic number.

(a) 7,3 Li

The number of protons: 3.

Number of electrons: 3.

Number of neutrons: 7-3=4.

(b) 125,52 Te

The number of protons: 52.

Number of electrons: 52.

Number of neutrons: 125-52=73.

(c) 109,47 Ag

The number of protons: 47.

Number of electrons: 47.

Number of neutrons: 109-47=62.

(d) 15,7 N

The number of protons: 7.

Number of electrons: 7.

Number of neutrons: 15-7=8.

(e) 31,15 P

The number of protons: 15.

Number of electrons: 15.

Number of neutrons: 31-15=16.

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