Atomic History and Structure

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

• negatrons 

• electrons 

• neutrons 

• protons 

An atoms overall charge is 

• positive 

• depends on its mood 

• neutral 

• negative 

The smallest particle of any particular type of matter is known by which of the following terms?

• Compound

• Atom

• Chemical

• Element

If an atom has 3 electrons, how many protons does it have?

• 1

• 2

• 4

• 3

The subatomic particle with a negative charge is the

• electron

• proton

• neutron

• nucleus 

If the number of protons equal the number of _____, the atom will have no charge

• protons

• neutrons

• electrons

• nucleus

What is the atomic number?

• the number of protons

• the number of protons and neutrons

• the number of neutrons

• the number of protons and electrons

What is the mass number?

• the number of protons

• the number of protons and neutrons

• the number of neutrons

• the number of protons and electrons

An atom with an unequal number of protons and electrons is said to have (a) ___.

• no charge

• balance

• charge

• unbalance

Two atoms of the same element but with different mass numbers are called________

• electrons

• isotopes

• variables

• electron cloud