Atomic Structure

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

• Democritus

• Aristotle

• Dalton

• Rutherford

Dalton's model of an atom is best described as

• a solar system

• a solid sphere

• a plum pudding

• an electron cloud

Who provided the first evidence that atoms contain subatomic particles?

• Dalton

• Rutherford

• Thomson

• Bohr

Almost all the mass of an atom is located in its

• protons

• electrons

• electron cloud

• nucleus

An electron is a particle with

• a negative charge, found in the nucleus

• a positive charge, found in the nucleus

• no charge, found outside the nucleus

• a negative charge, found outside the nucleus

Which particle is the least massive?

• proton

• electron

• neutron

• nucleus

All atoms of an element have the same

• mass number

• number of isotopes

• atomic number

• number of neutrons

The number of neutrons in an atom equals the

• mass number minus atomic number

• atomic number plus number of electrons

• mass number plus atomic number

• atomic number minus mass number

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

• 16

• 34

• 18

• 50

Atoms emit energy as light when

• electrons move to a higher energy level

• electrons move to a lower energy level

• protons move to a higher energy level

• protons move to a lower energy level

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