Los Angeles Valley College » Biology » Biology 003 - Introduction to Biology » Fall 2022

Question #1

An atom whose atomic number is 10 has how many electrons in its outermost energy level?

A. five

B. eight

C. two

D. three

E. ten

Question #2

Atoms form bonds to:

A. fill their outer shells with protons.

B. obtain an equal number of protons and neutrons

C. fill their outer shells with electrons..

D. fill their outer shells with neutrons.

E. obtain an equal number of protons and electrons.

Question #3

An atom becomes an ion when:

A. hydrogen ions are shared.

B. it gains or loses electrons.

D. it gains or loses neutrons.

E. it gains or loses protons.

F. it forms a covalent bond.

Question #4

The electrons of an atom contribute significantly to the mass of an atom.

A. True

B. False

Question #5

Chemical reactions involve only the outermost electrons of an atom.

A. False

B. True