Grade 8 The Atom Unit Exam (Summer School)

A particle that moves around the nucleus of an atom is an _______.

• Proton

• Neutron

• Electron

• Quark

Particles in an atom that are neutral and have no charge are _____.

• negatrons

• electrons

• neutrons

• protons

The positive particles of an atom are called _____.

• electrons

• positrons

• neutrons

• protons

What does the nucleus of an atom contain?

• Electrons and neutrons
• Protons and neutrons
• Neutrinos and positrons
• DNA and RN

In terms of matter, the atom is almost entirely filled with _____

• orbiting electrons
• charged protons
• heavy neutrons
• empty space

Of the three subatomic particles, which is the smallest and the lightest?

• protons 
• neutrons
• electrons
• They are all equal.

An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?

• 15

• 31

• 16

• 47

How many Protons are in one atom of Lithium?

• 3
• 6
• 7
• 6.941

Which is the smallest?

• electron
• proton
• atom
• neutron 

An atom has 5 protons and 7 neutrons. What is the mass number of the atom?

• 5
• 7
• 2
• 12