Chemistry Review Question Preview (ID: 14364)


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The atomic mass of an atom can be found by
a) adding the number of protons and number of neutrons in the atom.
b) adding the number of protons and number of electrons in the atom.
c) adding the number of neutrons and number of electrons in the atom.
d) subtracting the number of neutrons from the number of protons in the atom.

The value of the atomic mass of an atom is
a) the sum of the mass of the protons in the atom.
b) the average mass of all the different ions of the atom.
c) the average mass of all the different isomers of the atom.
d) the average mass of all the different isotopes of the atom.

The isotope sodium-20 has how many neutrons?
a) 9
b) 10
c) 11
d) 12

The isotope sodium-20 has how many protons?
a) 9
b) 10
c) 11
d) 12

Isotopes of an element will always have the same
a) number of protons
b) number of neutrons
c) number of electrons
d) mass

Molar mass is measured in units of
a) amu
b) milliters
c) milligrams
d) grams/mole

A mole is the amount of a substance that contains as many particles as the number of atoms in 12 grams of what isotope?
a) Boron-12
b) Carbon-12
c) Calcium-39
d) Aluminum-26

All atoms of the same element have the same
a) number of neutrons
b) number of protons
c) mass numbers
d) mass

Isotopes of the same element have different
a) numbers of neutrons
b) number of protons
c) number of electrons
d) atomic number

Isotopes of the same element have different
a) positions on the periodic table
b) atomic numbers
c) mass numbers
d) elemental symbols

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