2. Atoms & Elements

Which of the following is considered the basic unit of matter?

Which of the following is the mass number of a typical helium atom?

Which subatomic particles contribute to the net charge of an atom, and how does each affect the net charge?

Where are electrons located within an atom?

Identify if the statement below is true: There are 6 protons and 6 neutrons in the nucleus of a carbon-12 atom that are held by strong nuclear forces.

How many neutrons are present in a neutral atom of phosphorus-31?

What is the overall charge of an atom that contains 15 protons, 16 neutrons, and 17 electrons?

Phosphorus-33 (atomic number 15) contains how many neutrons?

How many oxygen atoms are present in a single molecule of water (H_2O)?

Why does an atom have no net electric charge?

How is the atomic number of an atom determined?

Where is most of the mass of an atom located?

In the electron cloud model of the atom, which statement best describes the location of electrons?

Which of the following are the three main subatomic particles that make up an atom?

What is the atomic number for sulfur?