Front

Who was the first person to study atomic theory? Options: Dalton, Democritus, Chadwick, Miller

Back

Democritus

Front

Why are electrons not factored into atomic mass?

Back

They are so small their mass is negligible.

Front

What experiment did JJ Thomson use?

Back

cathode ray tube experiment

Front

Which postulate of John Dalton about atoms was proven wrong? Options: All elements are made up of tiny indivisible particles called atoms., The atoms of one element are different from the atoms of another element., Atoms of different elements chemically combine to form chemical compounds., During chemical reactions, atoms are rearranged.

Back

All elements are made up of tiny indivisible particles called atoms.

Front

The number of protons is equal to the number of electrons for an atom. This means an atom is-

Back

electrically neutral

Front

What are atoms with the same number of protons but different numbers of neutrons?

Back

isotopes

Front

Which particles form the nucleus of the atom?

Back

protons and neutrons

Front

How does Carbon-12 and Carbon-14 differ? Options: # of protons, Mass #, # of neutrons, Mass # and # of neutrons

Back

Mass # and # of neutrons

Front

Which scientist used the gold foil experiment in his discovery?

Back

Rutherford

Front

What model of the atom came about first?

Back