What is the amount of matter in an object?

Which particles are positively charged and located in the nucleus of an atom?

Which particles are neutral and located in the nucleus of an atom?

Which particles are negatively charged and occupy the space outside the nucleus of an atom?

Where are the electrons located in an atom?

What is the positively charged region at the center of an atom called?

What does the atomic number of an atom represent?

The atomic mass is ______ ?

What is a pure substance made of one kind of atom called?

What is a substance made of two or more elements called?

What is the mass per unit volume of a substance called?

What is an atom that has gained or lost one or more electrons called?

What are atoms of an element having the same number of protons but a different number of neutrons called?

What is the electrical property of some objects that determines whether the object is positive, negative, or neutral?