2. Atoms & Elements

In which of the following is the number of neutrons correctly represented for the given isotope?

Which of the following represents the iodine isotope that contains 74 neutrons?

An isotope of yttrium has 39 protons and 59 neutrons. What is the mass number of this isotope?

An atom of carbon-14 has an atomic number of 6. How many neutrons does this atom have?

If the mass of Br-81 is 80.9163 amu, which of the following is closest to the mass of Br-79?

Are two atoms of the same element always identical?

How many neutrons does a lithium atom with a mass number of 7 have?

How are isotopes of a given element similar?

Which of the following statements correctly describes isotopes?

Which is the correct isotope symbol for an atom with 42 protons and 49 neutrons?

Which isotope of argon has 22 neutrons?

Which isotope of krypton has 50 neutrons?

What is the atomic number of all calcium isotopes?

Isotopes of an element differ from one another in the number of which subatomic particles they contain?

How many neutrons are contained in the isotope ruthenium-101 (Ru-101)?