PS: 11.1 Study guide: Inside the Atom

The smallest particles of an element that still have the element’s properties are

Which statement is true about the nucleus of an atom?

• a. It makes up most of the atom’s volume.

• b. It makes up most of the atom’s mass.

• c. It contains protons and electrons.

The strong force explains why

• electrons are attracted to the nucleus.

• the nucleus does not fly apart.

• electrons are smaller than protons.

The mass number of an atom is its number of

• electrons.

• protons.

• neutrons.

• protons plus neutrons.

When a fluorine atom gains an electron, it becomes a(n)

All protons are exactly the same.

• true

• false

Electrons have the same mass as protons.

• true

• false

Atoms may be positive or negative in charge.

• true

• false

All atoms of a given element have the same number of electrons.

• true

• false

There are three quarks in each neutron.

• true

• false