2. Atoms & Elements

Which of the following is the number of neutrons in the most abundant isotope of oxygen, oxygen-16?

What is the total number of protons, neutrons, and electrons in a neutral atom of cadmium-112 (Cd-112)?

Which statement best describes the structure of an atom?

What is the atomic number of fluorine?

How many protons and neutrons are in an atom of carbon-14?

Where is most of the mass in an atom located?

Aluminum has an atomic number of 13 and a mass number of 27. How many neutrons does a typical atom of aluminum contain?

An atom has an atomic mass of 28 and contains 14 neutrons. What element is it?

Which of the following gases is the most abundant in Earth's atmosphere?

Approximately what percentage of the volume of an atom is considered to be empty space?

What are the basic units of matter?

How many hydrogen atoms and how many oxygen atoms are present in a single molecule of water (H_2O)? (Choose the correct pair of numbers for hydrogen and oxygen atoms, respectively.)

If an element has 6 protons, which element is it?

Which part of the atom carries a positive charge?

Where are the electrons located in an atom?