which of the following equals one atomic mass unit?

1/12 the mass of one carbon-12 atom

Dalton's atomic theory included which idea?

Atoms of the same element are always identical

the average atomic mass of an element is the

weighted avg. of the masses of all isotopes of the element

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chem ch 3 review

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Questions 12

Answers

1
all atoms of the same element have the same __
mass
mass numbers
number of neutrons
number of protons
2
The sum of protons and neutrons in an atom equals the _____________
the number of electrons
mass number
atomic number
nucleus number
3
which of the following equals one atomic mass unit?
the mass of one electron
the mass of one carbon-12 atom
the mass of one helium-4 atom
1/12 the mass of one carbon-12 atom
4
how many neutrons are in ¹⁶O
16
8
24
4
5
Dalton's atomic theory included which idea?
Atoms of the same element are always identical
All atoms of all elements are the same size
Atoms of diff. elements always combine in 1:1 ratios
Individual atoms can be seen with a microscope
6
the atomic # of an element is the total # of which particles
neutrons
gluons
protons and electrons
protons
7
What does the number 84 represent in the name krypton-84
the mass number
twice the number of protons
the atomic number
the sum of the protons and electrons
8
The particles that are found in the nucleus of an atom are _____
protons and neutrons
protons and electrons
electrons only
neutrons and electrons
9
Isotopes of the same element have different __
numbers of protons
numbers of neutrons
atomic numbers
numbers of electrons
10
which of the following would be correct
Zn, 30 protons, 60 electrons
F, 19 protons, 19 electrons
In, 49 protons, 49 electrons
Cs, 55 protons, 132.9 electrons
11
the average atomic mass of an element is the
avg. of the mass# and the atomic # for the element
total # of subatomic particles in the element
weighted avg. of the masses of all isotopes of the element
total mass of the isotopes of the element
12
Which of the following is not part of Dalton's atomic theory
atoms of the same element are identical
all elements are composed of atoms
atoms are always in motion
atoms that combine do so in simple whole-number ratios

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