Atomic Models Introduction

Democritus is usually credited with the term "atom". What did the Greek word atom mean?

• very small

• building block

• can't divide

• invisible sphere

Lavoisier is sometimes called the "father of chemistry" and is especially remembered for his experiments demonstrating this basic concept of chemistry:

• all matter is made of atoms

• the law of conservation of matter

• the law of definite proportion

• properties of elements are periodic

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John Dalton used the mass of different compounds made from the same elements to demonstrate this idea that could be explained by the existence of atoms.

• law of conservation of matter

• law of definite proportion

• law of ideal gases

• law of multiple proportion

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Which of the following would be the closest analogy to Dalton's model of the atom?

• solar system

• plum pudding

• marble

• a ripple in water standing still

This particle was the first subatomic particle discovered, leading science to discard Dalton's model of the atom.

• electron

• proton

• neutron

• photon

JJ Thomson used a cathode ray tube and a magnet to show that there is a subatomic particle with this property:

• positive charge

• no electric charge

• negative charge

• wave properties

Which of the following is the best analogy for Thomson's model of the atom?

• marble

• plum pudding

• solar system

• ripple in water standing still

Which of the following ideas about atomic structure resulted from Rutherford's gold foil experiments?

• atoms are made of smaller subatomic particles

• electrons exist in distinct energy levels

• atoms have mass concentrated in a tiny, positively charged nucleus

• electrons can exist as both waves and particles

Bohr's model of the atom explained which of these?

• absorption and emission lines in atomic spectra

• the radiation curve of a heated object

• why matter is conserved in chemical reaction

• interference patterns when beams are split

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What analogy best compares to Bohr's model of the atom?

• marble

• plum pudding

• solar system

• ripple in water that isn't moving