2. Atoms & Elements

Tin (Sn) has an atomic number of 50 and its most abundant isotope has a mass number of 120. How many neutrons are present in this isotope of tin?

Which part of the atom is primarily involved in chemical reactions?

Which of the following correctly identifies the three main subatomic particles found in an atom?

The form of oxygen that combines three oxygen atoms into each molecule is called ____.

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?