Ch. 3.1 and 3.2 Introduction to Atoms

The volume of an atom is due to

Most of an atoms mass comes from empty space in which electrons move.

Which particles have a negative charge?

An element is

True or False: an atom is the smallest unit of matter that retains properties of the matter

Protons and neutrons have about the same

Atomic # of phosphorus = 15. Atomic mass # = 31. How many protons in a phosporus atom?

True or False: Mass of an atom is measured in grams.

# of protons = # of electrons which makes an atom

In the 1800's Mendeleev organized the first truly useful

The modern periodic table is arranged in order of

The atomic number is based on the

Atoms with the same number of protons but a different number of neutrons are called

Because atoms are so small

The nucleus of an atom contains which particles?

How is the mass of an atom determined?

Which parts of the atom move around the nucleus?

From an element's location on the periodic table you can predict its