Unit 2: Electricity and the Atom

Name the 3 subatomic particles in an atom.

• Neutrons, Protons, Electrons

• Ions, anions, cations

• small, medium, large

What is an ion?

• A neutral atom

• A charged atom

• A positively charged atom

What is an isotope?

• The name of an element

• A charged atom

• An element with different number of neutrons

The number of protons in an atom is the same as the...

• Atomic mass

• Atomic number

• Atomic scale

To find the mass number of an element, you need to...

• add the number of protons and neutrons together

• subtract the number of protons from the mass

• multiply the protons and electrons

When an atom has more electrons than protons, it becomes...

• positively charged

• neutral

• negatively charged

An atom's VALENCE SHELL is...

• the innermost shell of electrons

• the outermost shell of electrons

• the closest shell to the nucleus

An electrical current is the movement of negative electrical charges through a...

• conductor

• insulator

• power plant

Insulators hold onto their electrons...

• tightly

• loosely

• insulators repel electrons

Conductors hold onto their electrons...

• Loosely

• Tightly

• Conductors repel electrons