Unit 1: 7th L 4-10 Vocabulary

The basic particle from which all elements are made

(a)  

The average mass of all the isotopes of an element.

The number of protons in the nucleus of an atom

The temperature at which a liquid boils.

(a)  

A change in which one or more substances combine or break apart to form a new substance.

A short way to show a chemical reaction, using symbols

Symbols that show the elements in a compound and the ratio of atoms

A one-or two letter representation of an element

(a)  

A number in front of a chemical formula in an equation

A substance made of 2 or more elements chemically combined in a specific ratio or proportion.