2. Atoms & Elements

If the natural abundance of Br-79 is 50.69%, what is the natural abundance of Br-81?

Which isotope of argon has 22 neutrons?

Which of the following is the correct isotope symbol for an atom containing 20 protons and 22 neutrons?

Two atoms that are isotopes of one another must have a different number of which subatomic particle?

An atom has an atomic number of 25 and a mass number of 55. How many neutrons are present in its nucleus?

Which of the following correctly represents the isotope of carbon with 6 protons and 8 neutrons in isotope notation?

How many neutrons are present in the nucleus of a germanium (Ge) atom with a mass number of 73?

Can two atoms with the same mass number ever be isotopes of each other?

Which of the following factors directly affects the average atomic mass of an element that exists as a mixture of isotopes?

A lithium atom has an atomic number of 3 and a mass number of 7. How many neutrons are in this lithium atom?

Which of the following pairs represent isotopes?

How many neutrons are in a typical atom of sodium (Na) with an atomic number of 11 and an atomic mass of 23?

Which isotope of sulfur has 16 neutrons?

Which statement about isotopes is correct?

Which statement explains why carbon-14 dating cannot be used to date ancient rocks?