Isotopes and Atomic Mass Flashcard

Front

Isotopes are atoms of the same element that have different

Back

masses.

Front

As the mass number of an element's isotopes increases, the number of protons

Back

remains the same.

Front

The average atomic mass of an element is the average of the atomic masses of its

Back

naturally occurring isotopes.

Front

The average atomic mass of an element

Back

may not equal the mass of any of its isotopes.

Front

The atomic mass of an element listed in the periodic table is the

Back

average atomic mass.

Front

Carbon-14 (atomic number 6), the radioactive nuclide used in dating fossils, has how many neutrons?

Back

8 neutrons.

Front

What does the number 84 in krypton-84 represent?

Back

the mass number

Front

How do the isotopes of hydrogen-1 and hydrogen-2 differ?

Back

Hydrogen-2 has one neutron, hydrogen-1 has none.

Front

What unit is used to measure the weighted atomic mass?

Back

amu

Front

Which of the following equals one atomic mass unit? Options: the mass of one electron, the mass of one helium-4 atom, the mass of one carbon-12 atom, one-twelfth the mass of one carbon-12 atom

Back

one-twelfth the mass of one carbon-12 atom