2. Cell Chemistry & Cell Components

The subatomic particle with the least mass

(a) Carries a negative charge

(b) Carries a positive charge

(c) Plays no part in the atom's chemical reactions

(d) Is found only in the nucleus

Isotopes of an element differ from each other in the number of

(a) Protons in the nucleus

(b) Neutrons in the nucleus

(c) Electrons in the outer shells

(d) a, b, and c are all correct

The number and arrangement of electrons in an atom's outer energy level (valence shell) determine the atom's

(a) Atomic weight

(b) Atomic number

(c) Molecular weight

(d) Chemical properties

What are the three subatomic particles in atoms?

An atom of the element calcium has 20 protons and 20 neutrons. Determine the following information about calcium:

(a) Number of electrons

(b) Atomic number

(c) Atomic weight

(d) Number of electrons in each energy level