BJU Chemistry Chp 4 Test

The __________ describes how any sample of water contains 8 g of oxygen for every 1 g of hydrogen.

• Aufbau principle

• Bohr model of the atom

• Heisenberg uncertainty principle

• law of definite composition

Which was the first model to include the different masses of different elements?

• Hund's model

• Bohr's model

• Rutherford's model

• Dalton's model

Thomson's cathode rays were __________.

• protons

• electrons

• neutrons

• x-rays

Which of the following subatomic particles has the least mass?

• electron

• proton

• neutron

• nucleon

Who is credited with the discovery of the neutron?

• Niels Bohr

• James Chadwick

• Hans Geiger

• Ernest Rutherford

Who first identified and named the proton?

• Niels Bohr

• James Chadwick

• Ernest Rutherford

• J. J. Thomson

Whose work helped to explain line spectra?

• Niels Bohr

• Hans Geiger

• Ernest Rutherford

• Werner Heisenberg

Who conducted the experiment in which alpha particles were deflected by gold foil?

• James Chadwick

• Werner Heisenberg

• Wilhelm Roentgen

• Hans Geiger

Who proposed the "planetary" model of the atom?

• Niels Bohr

• John Dalton

• Albert Einstein

• Ernest Rutherford

Because energy levels are ___________, energy emissions come in certain quantities.

• definite

• exact

• specified

• quantized