We can represent atoms by listing the number of protons, neutrons, and electrons-for example, 2p, 2n, 0, 2e - for helium. Which of the following represents the 18O isotope of oxygen? a. 6p+, 8n0, 6e-b. 8p+, 10n0, 8e-c. 9p+, 9n0, 9e-d. 7p+, 2n0, 9e-e. 10p+,8n0, 9e-

B. 8 e-, 8p+, 10n0

Explanation:

For the Oxygen-18 isotope,

Mass number = atomic number + number of neutron

For an electrically neutral atom, the number of proton is the atomic number.

Mass number = number of proton + number of neutron

The mass of proton is the same as the mass of neutron but the mass of a electron is negligble.

For isotopes, atoms with the same atomic number but different neutron numbers, hence different mass numbers.

Mass number of O-18 = 18

Atomic number of oxygen = 8

Number of neutron = 18 - 8

= 10

Number of proton = 8

Number of electron = 8

Therefore, 8 e-, 8p+, 10n0