BMST - Basic Math and Science Atomic Structure and Bonding Questions and Answers 4

Question 1

Carbon-12 and Carbon-14 are isotopes. How do they differ?

Accepted Answer

Number of neutrons

Answer

Carbon-12 has 6 neutrons while Carbon-14 has 8 neutrons; both have 6 protons.

Question 2

Which property of an atom is represented by its mass number?

Accepted Answer

Total number of protons and neutrons

Answer

The mass number equals the sum of protons and neutrons in the nucleus.

Question 3

A polar covalent bond forms when two atoms share electrons:

Accepted Answer

Unequally, because one atom pulls electrons more strongly

Answer

In polar covalent bonds, the more electronegative atom attracts the shared electrons more strongly.

Question 4

Which of the following best describes a cation?

Accepted Answer

An atom that has lost one or more electrons

Answer

A cation is a positively charged ion formed when an atom loses electrons.

Question 5

In the Bohr model of the atom, electrons emit energy when they:

Accepted Answer

Move from a higher to a lower energy level

Answer

Electrons release a photon of energy when they fall from a higher to a lower energy level.

BMST - Basic Math and Science Test Practice Test