2. Atoms & Elements

The atomic mass of the element niobium (Nb) is 92.906 amu. Which of the following measurements correctly represents this atomic mass?

What is the mass number for an atom of barium containing 56 protons and 78 neutrons?

Which of the following best describes the difference between atomic number and mass number?

Which of the following is closest to the atomic mass of carbon?

Which numerical setup can be used to calculate the atomic mass of the element copper, given that copper has two naturally occurring isotopes: Cu-63 (abundance 69.17%, mass 62.93 u) and Cu-65 (abundance 30.83%, mass 64.93 u)?

Given the mass spectrum data of an element with isotopes having masses of 10 amu (20% abundance), 11 amu (50% abundance), and 12 amu (30% abundance), calculate the atomic weight and identify the element.

What is the average atomic mass of fluorine?

What is the atomic mass of a boron atom that has 6 neutrons?

Which element has a higher atomic mass: cadmium or zinc?

What is the average atomic mass of uranium to the nearest hundredth of an atomic mass unit?

Which element in the nonmetal halogen family has an atomic mass closest to 35?

Which of the following best describes the difference between atomic mass and atomic number?

Which of the following pairs of subatomic particles are approximately equal in mass?

Which term refers to the average mass of all the naturally occurring isotopes of an element?

What is the average atomic mass of gallium (Ga) as listed on the periodic table?