Question

the table below gives the numbers of protons, electrons, and neutrons in four atoms.

atom	number of protons	number of neutrons	number of electrons
2	9	9	8
3	9	9	10
4	9	10	9

based on the table, which atom has a charge of -1?
o 1
o 2
o 3
o 4

Explanation:

Step1: Recall charge - calculation formula

The charge of an atom = number of protons - number of electrons.

Step2: Calculate charge of atom 1

For atom 1, number of protons = 9, number of electrons = 9. Charge = 9 - 9=0.

Step3: Calculate charge of atom 2

For atom 2, number of protons = 9, number of electrons = 8. Charge = 9 - 8 = 1.

Step4: Calculate charge of atom 3

For atom 3, number of protons = 9, number of electrons = 10. Charge = 9 - 10=-1.

Step5: Calculate charge of atom 4

For atom 4, number of protons = 9, number of electrons = 9. Charge = 9 - 9 = 0.

Answer:

C. 3