Inside the Atom

Which statement is true about the nucleus of an atom?

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

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

• It contains protons and electrons.

• It is neutral in electric charge.

The atomic number of an atom is 10 and its mass number is 21. How many protons, neutrons, and electrons does the atom have? Explain your reasoning.

Tags

NGSS.MS-PS1-1

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

• quarks.

• gluons.

• protons.

• atoms.

Tags

NGSS.MS-PS1-1

The strong force explains why

• electrons are attracted to the nucleus.

• the nucleus does not fly apart.

• electrons are smaller than protons.

• none of the above

The mass number of an atom is its number of

• electrons.

• protons.

• neutrons.

• protons plus neutrons.

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

• True

• False

Neutral particles inside the nucleus of an atom are N__________.

Protons consist of smaller particles called Q__________.

Negatively charged particles in atoms are E__________.

An atom with a different number of neutrons than other atoms of the same element is called an I__________.