2. Atoms & Elements

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?

Which particles make up the nucleus of an atom?

How many electrons are present in a neutral atom of copper (Cu)?

How many protons are in a sodium atom?

Which of the following best describes the difference between an atom and a molecule?

Which of the following defines the atomic number of a given element?

Which of the following best describes the composition of a comet?

Which is one piece of information that the atomic number (9) gives about an atom of fluorine?