Multiple Choice
What is the mass number of the most common isotope of potassium?
2. Atoms & Elements
Atomic Mass
Back2. Atoms & Elements
Atomic Mass
- Multiple ChoiceAn element has two naturally occurring isotopes. One has an abundance of 37.40% and an isotopic mass of 184.953 amu, and the other has an abundance of 62.60% and a mass of 186.956 amu. What is the average atomic mass of the element?
- Multiple ChoiceWhat is the atomic number for potassium?
- Multiple ChoiceWhich term is defined as the sum of protons and neutrons in an atom?
- Multiple ChoiceAn atom has 20 electrons and 20 neutrons. What is the atomic mass of this atom if it also has 20 protons?
- Multiple ChoiceAn atom of lithium has 3 protons and 4 neutrons. What is the atomic mass of this lithium atom?
- Multiple ChoiceWhat distinguishes one element from another in terms of atomic structure?
- Multiple ChoiceWhich term represents the sum of the atomic masses of the atoms in a molecule?
- Multiple ChoiceWhat is the atomic number of lithium?
- Multiple ChoiceWhat is the atomic number of potassium?
- Multiple ChoiceWhat is the mass number of an atom with 5 protons and 7 neutrons?
- Multiple ChoiceWhat is the mass number of sodium?
- Multiple Choice
Which of the following choices has the greatest atomic mass?
- Multiple Choice
Neon possesses three naturally occurring isotopes. 20Ne has a percent abundance of 90.48% and an isotopic mass of 19.99244 amu, 21Ne has a percent abundance of 0.27% and an isotopic mass of 20.99384 amu, and 22Ne has a percent abundance of 9.25%. What is the isotopic mass of the 22Ne isotope?
- Multiple Choice
Three isotopic forms of potassium exist: 39K, 40K and 41K. Potassium has an atomic mass of 39.0983 amu. Potassium-40 has an isotopic mass of 39.9640 amu and natural abundance of 0.0117%. Potassium-41 has an isotopic mass of 40.9618 amu and natural abundance of 6.7302%. What is the isotopic mass of Potassium-39?