Review

Which two particles make up the nucleus of an atom?

• Protons and Electrons
• Protons and Neutrons
• Molecules and Compounds
• Neutrons and Electrons

In an atom, what is the number of protons equal to?

• The number of electrons.
• The number of neutrons.
• The number of molecules.
• The number of nuclei.

The particles with no charge in an atom are the _______.

• electrons
• neutrons
• protons
• protons and neutrons

The positively charged particles of an atom are the ________.

• electrons
• protons
• neutrons
• protons & neutrons

Which element has 31 protons ?

• Gallium 
• Germanium
• Gadolinium
• Polonium

Oxygen’s atomic number is 8. This means that an oxygen atom must have

• 8 electrons
• 8 protons
• 8 neutrons
• a mass number of 8

Which statement best describes an electron?

• Smaller mass than a proton and a negative charge
• Smaller mass than a proton and a positive charge
• Greater mass than a proton and a negative charge
• Greater mass than a proton and a positive charge

What is the role of an electron in an atom?

• Electrons live inside the nucleus and carry a neutral charge.
• Electrons circle the nucleus and have a positive charge.
• Electrons circle the nucleus and have a negative charge.
• Electrons live inside the nucleus and have a negative charge.

What are the three particles that make up the atom?

• protons, neutrons and isotopes

• protons, negatives and electrons

• neutrons, isotopes and electrons

• protons, neutrons and electrons

How many protons are in the isotope pictured above?

• 29

• 34

• 63

• 92