Atomic Structure Exam Review

Which scientist developed a principle that states that it is not possible to know precisely both the velocity and the position of a particle at the same time?

• Heisenberg

• Bohr

• Rutherford

• Thomson

Which scientist conducted the gold foil experiment, which led to his conclusion that all of an atom’s positive charge and almost all of its mass were contained in a tiny, dense region in the center of the atom known as the nucleus?

• Heisenberg

• Bohr

• Rutherford

• Thomson

Which scientist proposed a quantum model, which correctly predicted the frequencies of the lines in hydrogen’s atomic emission spectrum?

• Heisenberg

• Bohr

• Rutherford

• Thomson

Which scientist developed the “plum pudding” model, which describes the atom as a uniform, positively charge sphere containing electrons?

• Democritus

• Bohr

• Dalton

• Thomson

Which scientist believed matter was composed of tiny particles called atomos?

• Democritus

• Bohr

• Dalton

• Thomson

Which scientist believed that different atoms combine in simple whole-number ratios to form compounds?

• Democritus

• Bohr

• Dalton

• Thomson

What is the charge of a proton?

• positive

• negative

• neutral

• zero

What is the charge of an electron?

• positive

• negative

• neutral

• zero

What is the charge of a neutron?

• positive

• negative

• neutral

• zero

Which of the following are examples of ions? Choose all that apply.

• helium

• Na+

• Br-

• carbon-14

Answer explanation

Ions are atoms that have gained or lost electrons, resulting in a positive or negative charge. Na+ and Br- are examples of ions as they have gained or lost electrons.