What did Rutherford's experiment with gold foil tell us about the atom?

it is mostly empty space with a small dense nucleus

Which list shows particles from least massive to most massive?

electron, proton, helium nucleus, lithium nucleus

How do the isotopes carbon-12 and carbon-14 differ?

carbon-12 has 6 neutrons, carbon-14 has 8

neutral as the # of protons = the # of electrons

Why do isotopes of the same element have the same chemical properties?

They have the same number of protons/electrons

Which is true about subatomic particles?

neutrons and protons have the same mass

same # protons, different # of neutrons

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Chemistry - 4 - Atomic Structure

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Review questions based on the Prentice Hall textbook - Chemistry (Wilbraham, Staley, Matta, and Waterman)

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Questions 25

Answers

1
The smallest particle of an element that retains the properties of that element
proton
atom
nucleus
neutron
2
Atomic mass of an element with 2 isotopes with relative abundances E-20 (75%) and E-22 (25%)?
20.5
21.5
20
21
3
What did Rutherford's experiment with gold foil tell us about the atom?
nucleus contains protons, neutrons, and electrons
it is mostly empty space with a small dense nucleus
nucleus contains protons and electrons
protons, neutrons + electrons are evenly spread through atom
4
The number of protons in the nucleus of an element is
mass number
atomic number
atomic mass
nuclear number
5
Which list shows particles from least massive to most massive?
electron, proton, helium nucleus, lithium nucleus
helium nucleus, hydrogen nucleus, proton, electron
proton, electron, hydrogen nucleus, helium nucleus
proton, neutron, electron, nucleus
6
How do the isotopes carbon-12 and carbon-14 differ?
carbon-12 has 12 neutrons, carbon-14 has 14
carbon-12 has 6 protons, carbon-14 has 8
carbon-12 has 6 neutrons, carbon-14 has 8
carbon-12 has 6 electrons, carbon-14 has 8
7
All atoms are
neutral as the # of neutron = the # of electrons
positive as the # of protons > the # of electrons
neutral as the # of protons = the # of neutrons
neutral as the # of protons = the # of electrons
8
Atomic Number 12, Mass Number 25, # neutrons equals
13
12
37
24
9
Total number of protons and neutrons in the nucleus of an atom is
mass number
atomic number
nuclear number
atomic mass
10
The weighted average of the masses of the isotopes of an element
atomic mass
nuclear number
mass number
atomic number
11
a negatively charged subatomic particle
proton
neutron
electron
nucleus
12
How many neutrons in oxygen 18?
9
10
8
18
13
Why do isotopes of the same element have the same chemical properties?
They have the same number of protons/electrons
They have the same nucleus
They have the same atomic mass
They have the same number of neutrons
14
Which is true about subatomic particles?
protons are positive and are the lightest particles
neutrons and protons have the same mass
neutrons and protons have the same charge
electrons are negative and are the heaviest particles
15
1/12 the mass of a carbon atom having 6 protons and 6 neutrons
1 nanogram
mass number
atomic mass unit
1 picogram
16
# neutrons = 118, # electrons = 79, atomic number equals
197
79
39
118
17
# neutrons = 118, # electrons = 79, mass number equals
197
79
39
118
18
What does the number 80 in bromine-80 indicate?
number of protons
sum of protons and electrons
atomic number
mass number
19
Atomic Number 12, Mass Number 25, # protons equals
13
24
12
37
20
the part of Dalton's Atomic Theory that we now know is not true.
Atoms make up matter
atoms of one element are different from atoms of any other.
Atoms combine in whole # ratios to form compounds
Atoms are indivisible
21
How do you find the number of neutrons in a nucleus?
atomic number - mass number
number of protons - number of electrons
mass number - atomic number
atomic number + number of electrons
22
central part of an atom, containing protons and neutrons.
nucleolus
nucleus
neutron
electron
23
a subatomic particle with no charge
proton
neutron
positron
electron
24
a positively charged subatomic particle
proton
positron
electron
neutron
25
isotopes have
same # protons + neutrons, different # of electrons
same # neutrons, different # of protons
same # electrons, different # of protons
same # protons, different # of neutrons

Chemistry - 4 - Atomic Structure Flashcards | StudBud