5th-6th Grade Test Chapter 12

An _____ is the building blocks of all matter.

• elements

• atoms

• molecules

• cell

The center of an atom is known as the _____.

• proton

• electron shell

• nucleus

• neutron

Most of the mass of an atom is located in _____.

• a proton

• a neutron

• the nucleus

• an electron

A _____ has a positive electrical charge.

• electron

• proton

• neutron

• atom

A _____ has no electrical charge.

• proton

• electron

• neutron

• none of the above

A _____ has a negative electrical charge.

• proton

• electron

• neutron

• nucleus

The green spheres represent _____.

• protons

• neutrons

• electrons

• nucleus

The red spheres represent _____.

• protons

• neutrons

• electrons

• nucleus

The yellow spheres represent _____.

• protons

• neutrons

• electrons

• nucleus

The red and green spheres are located inside the _____.

• electron shell

• atoms

• molecule

• nucleus