Chapter 6 Review - Junior Science

One of the first people to state that matter is made up of atoms was

• Democritus

• Aristotle

• Dalton

Dalton’s model of the atom is best described as

• A solar system

• Plum pudding

• A solid sphere

Who provided the first evidence that atoms contain subatomic particles?

• Dalton

• Thomson

• Rutherford

Almost all the mass of an atom is located in its

• Protons

• Electrons

• Nucleus

An electron is a particle with

• A negative charge, found in the nucleus.

• A positive charge, found in the nucleus.

• A negative charge, found outside the nucleus.

Which particle is the least massive?

• Proton

• Electron

• Neutron

All atoms of an element have the same

• Mass number

• Atomic number

• Number of isotopes

The number of neutrons in an atom equals the

• Mass number minus the atomic number.

• Atomic number plus the number of electrons.

• Atomic number minus the mass number.

The atomic number of sulfur is 16. How many electrons are in an atom of sulfur-34?

• 16

• 18

• 34

J.J. Thomson demonstrated that electrons

• Have a negative electric charge

• Have a positive electric charge

• Do not have an electric charge