Atomic Theory Practice test answers review

Which statement about subatomic particles is true?

An electron has far less mass than either a proton or neutron.

This Greek philosopher believed all matter to be comprised for four basic elements; earth, air, fire and water.

Aristotle

His model placed the electrons in orbits with specific amounts of energy around the nucleus.

Bohr

He confirmed the existence of a neutral subatomic particle with a mass similar to that of the proton

Chadwick

His famous five point theory of the atom's structure described atoms as indivisible solids that could combine in fixed proportions to form all the known compounds.

Dalton

Which statement accurately represents the arrangement of electrons in Bohr's atomic model?

Electrons travel around the nucleus in fixed energy levels with energies that vary from level to level.

His experiment using gold foil and a stream of alpha particles revealed the atom's dense positively charged nucleus.

Rutherford

He used advanced probability models to predict the most likely locations of electrons and the development of the electron cloud model of the atom.

Schrodinger

What can you assume has happened if an electron moves to a higher energy level?

The electron has gained energy

Which statement is true about oxygen-17 and oxygen-18?

They are isotopes of oxygen.

His cathode ray tube experiments revealed the tiny negatively charged particle later named the electron.

Thomson

The Greek philosopher Democritus coined what word for a tiny piece of matter that cannot be divided?

atom

To find the number of neutrons in an atom, you would subtract

atomic number from mass number.

The number of protons in one atom of an element is that element's

atomic number.

J. J. Thomson's experiments provided evidence that an atom

contains negatively charged particles

Of the subatomic particles listed below, which is not a part of the atom's nucleus?

electron

Of the subatomic particles listed below, which is the smallest?

electron

Which subatomic particle has a negative charge?

electron

In Niels Bohr's model of the atom, electrons move

like planets orbiting the sun.

The glowing of a neon light is caused by electrons emitting energy as they

move from higher to lower energy levels

Of the subatomic particles listed below, which has no electrical charge?

neutron

The nuclei of isotopes of the same atom contain different numbers of

neutrons

Rutherford's gold foil experiment provided evidence for the existence the

nucleus

What do scientists use to predict the locations of electrons in atoms?

probability

Of the subatomic particles listed below, which has a positive charge?

proton

In an electrically neutral atom, which two subatomic parts must be equal in number?

proton and electron

Of the subatomic particles listed below, which two have roughly the same mass?

proton and neutron

Protons and neutrons each contain three of these fundamental constituents of matter.

quarks

Democritus thought that matter was made of tiny particles:

that could not be divided

What caused some of the alpha particles to bounce straight back from the gold foil?

the gold atoms' nuclei

What does the electron cloud model describe?

the most likely locations of electrons in atoms

Which of the following is unique for any given element?

the number of protons

What is the maximum number of electrons that can occupy an orbital?

two