Worksheetsintroduction for atomic structure
Total questions: 26
Worksheet time: 26mins
Democritus is usually credited with the term "atom". What did the Greek word atom mean?
very small
building block
can't divide
invisible sphere
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
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 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
Who came up with the first atomic theory?
Dalton
Socrates
Thomas
Rutherford
Who discover the electron?
Dalton
Rutherford
Thomson
Bohr
What were John Dalton three contributions to atomic history?
Created the atomic theory
Discovered that the atom is mostly empty space
Believed that atoms of a given element are identical
Hypothesized that the atom is a tiny, hard sphere
Believed that the universe was made of tiny "uncuttable" particles
What were J. J. Thomson's three contributions to the atomic theory?
Discovered the electron
Discovered the nucleus -did the gold foil experiment
Used the cathode ray tube in his discovery
Created a model of the atom with electrons moving around the nucleus in fixed orbits
Created the "plum pudding" model of the atom
In 1897, J. J. Thomson showed that negative charges could be made to move from one end of a cathode ray tube to another, causing the tube to glow. Because of this, Thomson is credited with the discovery of the electron. Based on this information, which part of Dalton’s atomic theory conflicted with Thomson’s new data? (pg41 of notebook)
1
2
3
4
In a famous experiment conducted by Ernest Rutherford, a few positively charged alpha particles were scattered by a thin gold foil. Which of the following is a conclusion that resulted from this experiment?
The nucleus is negatively charged.
The atom is a dense solid and is indivisible.
The mass is conserved when atoms react chemically.
The nucleus is very small and the atom is mostly empty space.
True or False: Electrons are found in the nucleus.
True
False
