Physical Science Atomic Theory and Atomic Structure

Front

The sum of the number of protons and neutrons in an atom’s nucleus is called the:

Back

mass number

Front

An element that is usually soft, not malleable or ductile, and a poor conductor of heat and electricity is known as a:

Back

nonmetal

Front

The center of an atom that contains protons and neutrons and is surrounded by an electron cloud is called the:

Back

nucleus

Front

The number of protons in one atom of an element is referred to as the:

Back

atomic number

Front

A vertical column of elements in the periodic table is called a:

Back

group

Front

A negatively charged subatomic particle outside the nucleus of an atom is known as a(n):

Back

electron

Front

Electrons can exist between orbits according to Bohr’s atomic shell model. True or False?

Back

False

Front

A neutral atom contains more protons than electrons. True or False?

Back

False

Front

Mendeleev arranged the periodic table according to atomic mass. True or False?

Back

True

Front

Noble gases are highly reactive because they have seven valence electrons. True or False?

Back

False