2. Atoms & Elements

How many neutrons are present in the isotope tin-124?

A radioactive nuclide has 53 protons and 78 neutrons. Which is the symbol of this nuclide?

Which isotope of fluorine has 10 neutrons?

Which isotope of cobalt has 32 neutrons?

How many neutrons are present in the isotope manganese-54?

What does the number next to an isotope (for example, carbon-14) signify?

Which of the following isotopes would you expect to be stable?

An isotope of sodium (Na) has a mass number of 22. How many neutrons does it have?

How many neutrons does a lithium (Li) atom typically have?

Bismuth has an atomic number of 83 and its most common isotope has a mass number of 209. How many neutrons are present in this isotope of bismuth?

An atom of the isotope Cs contains how many protons (p)?

Which pair of atoms constitutes a pair of isotopes of the same element?

How many protons are present in an isotope of sodium with a mass number of 25?

Why did Hershey and Chase use the isotopes 32P and 35S in their experiments?