2. Atoms & Elements

How many neutrons are in a typical lithium atom with an atomic mass of 7?

Which of the following is correct for isotopes of the same element?

What is the mass number of an iron atom that has 28 neutrons?

Which subatomic particle is found in the nucleus of an atom and has a positive charge?

Which neutral atom has 5 valence electrons and 7 neutrons?

How many neutrons are present in the isotope germanium-75?

How does one isotope of a particular element differ from another isotope of the same element?

Which of the following statements best describes an isotope?

Gallium has two naturally occurring isotopes, 69Ga and 71Ga. If the atomic mass of gallium is 69.72 amu, which isotope is more abundant?

A sample of chlorine contains two naturally occurring isotopes: chlorine-35 (mass = 34.969 u, abundance = 75.78%) and chlorine-37 (mass = 36.966 u, abundance = 24.22%). What is the average atomic mass of chlorine?

Zinc has an atomic number of 30. How many neutrons are present in the most abundant isotope of zinc, Zn-64?

Can the atomic mass of an element vary, and if so, what is the reason for this variation?

Which noble gas isotope has exactly 48 neutrons?

An isotope of mercury has 80 protons and 120 neutrons. What is the mass number of this isotope?

If the haploid number of sphagnum moss is 19, what is its diploid number?