Early Ideas Of The Atom Question Preview (ID: 10640)
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J.J. Thompson, a British physicist, was the first to identify the
a) atomic theory
b) proton
c) neutron
d) electron
Using his observations, Dalton developed a theory that
a) Different elements have different masses and sizes
b) Different elements have different electron configurations
c) Different elements have different subatomic particles
d) Different elements have different electrical charges
Dalton was one of the first scientists to experimentally prove that
a) the nucleus and the electron have different electrical charges
b) most of the atom is made of empty space
c) the chemical and physical properties of an element correlate and its mass and size
d) the atom is composed of smaller pieces
Thomson was the first scientist to experimentally question
a) the existence of positive and negative particles within the atom
b) the existence of a nucleus within the atom
c) the existence of the atom
d) the existence of neutrons
Thomson's experiments were significant in that they questioned
a) whether matter is made up of atoms
b) whether the atom has a positive or negative charge
c) whether atoms will form compounds with other atoms
d) whether the atom could be broken up into smaller units
Rutherford's experiment showed that some substances allowed alpha particles to pass through them ______ frequently. He theorized this happened because the nuclei were ___.
a) more, smaller
b) less, smaller
c) more, the same size
d) less, the same size
Rutherford's experiment conflicted with Thompson's model because it showed that
a) the atoms contains positively and negatively charged particles.
b) the atom is composed of mostly empty space
c) the atom is full of a positively charged substance
d) the atom contains a nucleus with protons and neutrons.
J.J. Thomson and Ernest Rutherford would agree that
a) neutrons exist in the nucleus
b) atoms have more protons and electrons
c) protons and electrons exist in the nucleus
d) protons and electrons have different charges
From our current knowledge of the atom we can conclude that
a) Dalton was correct
b) Atoms of an element can have different numbers of protons
c) Atoms are divisible
d) Atoms of the same element are not always identical but all have the same mass
Which of the following was not a part of Dalton's atomic theory?
a) All elements are made of atoms
b) Atoms are always moving
c) Atoms of the same element have similar mass and size
d) Atoms combine in simple ratios
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