Atomic Theory and Structure

Calculation used to find the number of neutrons in an atom

• Atomic Mass - Atomic Number

• Atomic Number - Atomic Mass

• Atomic Mass - Electrons

• none of these

Who stated that atoms cannot be divided?

• Democritus

• Dalton

• Thomson

• Bohr

Place the following scientists in order, from earliest to latest: 
Rutherford, Dalton, Bohr, Thomson

• Dalton, Rutherford, Bohr, Thomson

• Thomson, Dalton, Rutherford, Bohr

• Dalton, Thomson, Rutherford, Bohr

• Bohr, Dalton, Rutherford, Thomson

Who discovered the nucleus using the gold foil experiment?

• Democritus

• Robert Millikan

• James Chadwick

• Ernest Rutherford

Who's model is this? 

• Millikan

• Rutherford

• Thomson

• Bohr

Tags

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In Bohr's model of the atom, where are the electrons located?

• in the center of the atom

• in energy levels outside the nucleus

• spread throughout the atom, like a chocolate chip cookie

Which part(s) of Dalton's atomic theory are false? Check all that apply.

• Atoms are indivisible (cannot be divided).

• Atoms of different elements can chemically combine to form compounds.

• During chemical reactions, atoms are rearranged, but never created or destroyed.

• Atoms of the same element are identical.

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Why is an atom considered electrically neutral?

• The number of protons equals the atomic number.

• The number of electrons equals the number of neutrons.

• The number of protons is the same as the number of electrons.

• The number of electrons equals the number of protons.

Based on the gold foil experiment, what did Rutherford conclude about the atom. Check all that apply.

• The electrons orbit in definite paths around the nucleus.

• The atom contains a central, positively charged nucleus.

• It is impossible to know an electron's location and its speed at the same time.

• The atom is mostly empty space.

JJ Thomson used his cathode ray tube experiments to discover --

• a negatively charged particle called an electron

• a positively charged particle called a proton

• alpha particles

• a neutral particle called a neutron