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Atoms and Elements
Atoms and Elements
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1
Subatomic particles that have a negative charge:
protons
ions
neutrons
electrons
2
An atom has 10 protons, 10 electrons, and 12 neutrons. What is its atomic number?
12
22
2
10
3
Who discovered the electron?
Ernest Rutherford
John Dalton
JJ Thomson
Eugene Goldstein
4
How many electrons are in the following atom?
17
18
35
52
5
Who performed the gold foil experiment?
JJ Thomson
Niels Bohr
John Dalton
Ernest Rutherford
6
Subatomics particles that have no charge:
protons
ions
neutrons
electrons
7
An atom has 13 protons and 14 neutrons. How many electrons does it have?
1
27
14
13
8
In the atom "nitrogen - 15," what does the "15" represent?
atomic number
atomic mass
atom
mass number
9
Protons and electrons have the same relative mass.
FALSE
TRUE
10
Who described the atom as "indivisble and indestructable?"
Dalton and Democritus
JJ Thomson only
Democritus only
Dalton and Thomson
11
Which element has the symbol Ag?
Gold
Aluminum
Beryllium
Silver
12
Cations are:
a feature of nonmetals when they react
have a 1+ charge only
positively charged ions
formed when metals GAIN electrons
13
Who discovered the proton?
Ernest Rutherford
Eugene Goldstein
Robert Millikan
JJ Thomson
14
Dalton's atomic theory helped explain the law of conservation of mass because it stated:
atoms could not combine
atoms all had the same mass
atoms could not be created or destroyed
atoms could be subdivided
15
The Greek philosopher to first propose the idea of atoms:
Democritus
Dalton
Plato
Galileo
16
What was used to determine that there is a densely packed nuecleus in the atom?
Oil Dropplet Experiment
Gold Foil Experiment
Cathode Ray Tube
Double Slit Experiment
17
Subatomic particles found in the nucleus of an atom:
neutrons and electrons
protons and electrons
protons and neutrons
protons, neutrons, and electrons
18
The number of protons in an atom is defined as the:
mass number
atomic mass
atomic number
isotope
19
Which of the following elements is a halogen?
Cadmium
Calcium
Chlorine
Carbon
20
An atom has an atomic number of 5 and mass number of 11. How many neutrons does it have?
11
5
6
none of the above
21
Hydrogen - 1 and Hydrogen - 2 are examples of what?
ions
neutrons
isotopes
none of the above
22
The pieces in the plum pudding model represent:
Protons
Neutrons
Electrons
Thompson
23
Mass number is defined as the number of ____________ in an atom.
neutrons
protons and neutrons
protons and electrons
protons
24
The model of the atom shown in this picture is called:
electron cloud model
plum pudding model
planetary model
nuclear model
25
Atoms that have the same number of protons but different number of neutrons are called:
ions
non-existent
nucleus
isotopes
26
How many neutrons are in the following atom?
7
3
4
10
27
The first scientist to propose an atomic theory based on experimental evidence was:
Thomson
Dalton
Rutherford
Democritus
28
Most of the mass of an atom is concentrated in the nucleus.
TRUE
FALSE
29
Atoms of carbon always have 6 protons.
TRUE
FALSE
30
Who discovered the neutron?
John Dalton
JJ Thomson
Ernest Rutherford
James Chadwick
31
Compounds are pure substances that by definition:
consist of oxygen and hydrogen
consist of two or more elements in combination
consist of solids
consist of a single element
32
An atom has 4 protons, 4 electrons, and 5 neutrons. What is its mass number?
9
8
5
4
33
Who discovered the nucleus?
John Dalton
Ernest Rutherford
JJ Thomson
James Chadwick
34
Which of the following is a compound?
Aluminum (Al) in a can
Gold (Au) in a ring
Mercury (Hg) in a thermometer
Salt (NaCl) in a shaker
35
Who determined the relative mass and charge of an electron?
Niels Bohr
Eugene Goldstein
Robert Millikan
John Dalton
36
Subatomic particles that have a positive charge.
neutrons
protons
ions
electrons
37
Atoms are mostly empty space.
TRUE
FALSE
38
Who proposed the nuclear model of the atom?
Democritus
Ernest Rutherford
JJ Thomson
John Dalton
39
Atoms of the same element can have different mass numbers.
TRUE
FALSE
40
All parts of Dalton's atomic theory are still true today.
TRUE
FALSE
41
Who proposed the plum pudding model of the atom?
John Dalton
Robert Millikan
Ernest Rutherford
JJ Thomson
