2. Atoms & Elements

What is the atomic number of an oxygen atom that has 8 protons and 10 neutrons in its nucleus?

How many protons does a nitrogen atom have?

How many naturally occurring elements are found on Earth?

Which of the following are the very small particles that make up matter?

Which of the following best describes the charge of an electron?

What is the total number of subatomic particles found in the nucleus of an atom of argon-40?

Which of the following is the smallest particle of an element that still retains all the chemical properties of that element?

How many protons does a gold (Au) atom have?

Which of the following is a characteristic of the nucleus (the part of the atom marked "a")?

Which of the following is the atomic number of boron?

What is the atomic number of nitrogen?

Approximately how much of the air we breathe is composed of nitrogen and oxygen combined?

Which term best describes the total amount of protons, neutrons, and electrons that make up an object?

A copper penny has a net charge of -3.2 × 10^{-19} C. How many electrons were transferred to create this charge on the penny?

An atom has 23 protons and 29 neutrons. Which is the correct chemical symbol for this atom?