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Chapter 4 Test - Physical Science Flashcards | StudBud
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Chapter 4 Test - Physical Science
the number of energy levels in an atom is determined by the
electrons
Chapter 4 Test - Physical Science
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Atomic Structure
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Answers
1
electrons
have a negative charge
are neutral
have a positive charge
are found in the nucleus of an atom
2
the number of energy levels in an atom is determined by the
nucleus
neutrons
protons
electrons
3
the scientist who is credited with discovering the nucleus of an atom
Democritus
Rutherford
Thomson
Dalton
4
the average atomic mass of an atom
is affected by the amount of known isotopes of that element
is a weighted average
all of the above
is an average of all of the known isotopes
5
Thomson's experiment was credited with finding the existence of
protons
electrons
neutrons
photons
6
non reacting atoms are neutral because
all of the above
electrons and protons are the same
neutrons and electrons are the same
protons and neutrons are the same
7
the first energy level of an atom can hold up to
18 electrons
8 electrons
2 electrons
4 electrons
8
neutrons
all of the above
are found in the nucleus
have a relative mass number of 1
have no charge
9
atoms of the same element with different numbers of neutons
molecules
compounds
ions
isotopes
10
the modern model of an atom has electrons traveling
spread evenly throughout the atom
all throughout the nucleus
an electron cloud
none of the above
11
how many electrons does potassium have
39
20
19
18
12
protons
identify an element
all of the above
are found in the nucleus of an atom
are positively charge particles
13
how many neutrons does an isotope of potassium 39 have
39
19
18
20
14
the atomic number of an atom is the number of
neutrons in that atom
all of the above
photons in that atom
protons in that atom
15
opposite charges
propel
distract
attract
repel
16
electrons in the outermost energy level of an atom
satisfied
valence
low energy
all of the above
17
how many electrons does an atom of lithium have
7
4
8
3
18
an isotope of chlorine 35 has how many neutrons
17
16
18
35
19
model of the atom stated that electrons travel in fixed energy levels around a nucleus
Thomson
Dalton
Rutherford
Bohr
20
how many protons does potassium have
18
39
19
20
21
which of the following statements were part of Dalton's atomic theory
atoms can be joined together to make compounds
atoms cannot be subdivided
all of the above
atoms of the same element are exactly alike
22
Democritus' theory of atomic structure was revised because
he had no scientific basis
all of the above
he had discovered electrons
he said that the atom was made up of smaller units
23
when an electron falls back down to ground state, what can occur
photon of light is destroyed
photon of light is released
photon of light is absorbed
none of the above
24
the number of protons and neutrons in an atom is it's
atomic number
energy level number
valence number
mass number
25
when an atom is reacting and gains or loses an electron it becomes a/an
atom
isotope
ion
photon
26
the lowest state of energy level for an electron is it's
excited state
outer state
all of the above
ground state
