Chapter 3 Atomic Theory Vocab

What the smallest unit of an element.

The decimal number in the periodic table that tells how many grams the mass of one mole is.

Atoms of the same element that have different masses

What is the symbol for an electron?

The sum of the protons and neutrons.

Avogadroes number of atoms is known as a

The positively charged central part of an atom, which includes two different types of particles

Who first conceived of the atomic theory in 1803

The number of protons in the nucleus.

A general term for any isotope of any element.

The word atom is from the Greek and means