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. ten

B. five

C. eight

D. two

E. three

Question #2

Atoms form bonds to:

A. obtain an equal number of protons and neutrons

B. obtain an equal number of protons and electrons.

C. fill their outer shells with neutrons.

D. fill their outer shells with electrons..

E. fill their outer shells with protons.

Question #3

An atom becomes an ion when:

B. hydrogen ions are shared.

C. it forms a covalent bond.

D. it gains or loses electrons.

E. it gains or loses protons.

F. it gains or loses neutrons.

Question #4

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

A. False

B. True

Question #5

Chemical reactions involve only the outermost electrons of an atom.

A. True

B. False