The atomic mass of an element depends on the ___ ?

mass and relative abundance of each isotope of that element

The nucleus of an atom is ....

the central core of atom, made of protons and neutrons

Which tenet of Dalton's atomic theory was revised about 100 years ago?

atoms are tiny indivisible particles

The atomic mass of an element is the ___ ?

weighted average of the masses of isotopes of the element

Which of the following equals one atomic mass unit?

1/12 of the mass of 1 carbon-12 atom

What is the relative mass of an electron?

1/1840 the mass of a hydrogen atom

Which statement is part of Dalton's atomic theory?

atoms of the same element are always identical

Why do chemists use the relative mass compared to a reference instead of actual mass of atoms?

the actual masses are very small and difficult to work with

How did JJ Thomson reason that electrons are part of the atoms for all elements?

electron charge-to-mass ratios are the same for all elements

neutral, with # protons equaling # electrons

Rutherford's discovery of the nucleus resulted in which atomic model?

electrons surround nucleus and occupy nearly all atom volume

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Benson Chem Unit 2 Rvw 2

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Chap 4 review

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Questions 23

Answers

1
The atomic mass of an element depends on the ___ ?
relative abundance of protons in that element
mass of each isotope of that element
mass and relative abundance of each isotope of that element
mass of each electron in that element
2
All atoms of the same element have the same ___ ?
number of neutrons
mass numbers
number of protons
mass
3
The nucleus of an atom is ....
the central core of atom, made of protons and neutrons
negatively charged with a high density of protons
negatively charged with a high density of electrons
positively charged with more protons than neutrons
4
Isotopes of the same element have different ___ ?
numbers of neutrons
numbers of protons
numbers of electrons
atomic numbers
5
Which tenet of Dalton's atomic theory was revised about 100 years ago?
atoms are tiny indivisible particles
compounds are made by combining atoms
atoms of the same element are identical
atoms of different elements can combine in whole # ratios
6
The atomic number of an element is the total # of which particles in the nucleus?
protons
protons and electrons
electrons
neutrons
7
In the Bohr atomic model, an electron in an orbit has a fixed ___ ?
size
color
energy
position
8
What does 232 represent in the name uranium-232?
the number of uranium atoms present in a sample
the sum of the protons and electrons
the atomic number
the mass number
9
The atomic mass of an element is the ___ ?
total mass of the isotopes of the element
average of the mass number and atomic number for the element
weighted average of the masses of isotopes of the element
total number of subatomic particles in its nucleus
10
Which of the following equals one atomic mass unit?
the mass of 1 carbon atom
1/12 of the mass of 1 carbon-12 atom
1/12 of the mass of 1 hydrogen atom
the mass of 1 electron
11
Isotopes of the same element have different _____ ?
mass numbers
atomic numbers
chemical behavior
positions on the periodic table
12
The sum of the protons and neutrons in an atom equals the ____ ?
atomic mass
atomic number
nucleus number
mass number
13
What is the relative mass of an electron?
1/1840 the mass of a hydrogen atom
1/1840 the mass of a C-12 atom
1/12 the mass of a hydrogen atom
1/12 the mass of a C-12 atom
14
Which statement is part of Dalton's atomic theory?
all atoms of all elements are the same size
atoms of different elements combine in 1-to-1 ratios
individual atoms can be seen with a microscope
atoms of the same element are always identical
15
Why do chemists use the relative mass compared to a reference instead of actual mass of atoms?
actual mass of electron is very large compared to a proton
the actual masses are very small and difficult to work with
actual masses of subatomic particles are not known
number of subatomic particles in different elements varies
16
How did JJ Thomson reason that electrons are part of the atoms for all elements?
an electron is nearly 2000x lighter than a hydrogen atom
electron charge-to-mass ratios are the same for all elements
cathode rays are negatively charged particles
cathode rays can be deflected by magnets
17
All atoms are ...
neutral, with equal # protons, neutrons, and electrons
neutral, with # protons equaling # electrons
negatively charged with # electrons outnumbering # electrons
positively charged with # protons outnumbering # electrons
18
How does an electron's energy change when it moves closer to the nucleus?
it decreases
it doubles
it stays the same
it increases
19
Rutherford's discovery of the nucleus resulted in which atomic model?
nucleus made up of protons, neutrons, and electrons
nucleus made of protons and electrons
Subatomic particles are evenly distributed in atom's volume
electrons surround nucleus and occupy nearly all atom volume
20
What unit is used to measure weighted average atomic mass?
angstrom
amu
nanogram
microgram
21
Which statement is NOT part of Dalton's atomic theory?
atoms of the same element are identical
atoms are always in motion
atoms that combine do so in whole-number ratios
all elements are composed of atoms
22
How is the number of neutrons in the nucleus of an atom calculated?
protons - electrons
mass number + electrons
electrons + protons
mass number - protons
23
In an element with the atomic # 16, the number of protons and electrons in a neutral atom are?
32 protons and 32 electrons
16 protons and 16 electrons
16 electrons and 16 neutrons
16 protons and 0 electrons

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