Grade 9 Science Unit 1 Chemical Symbols And Formulas printable pdf download

Grade 9 Science Unit 1 Chemical Symbols And Formulas

Grade 9 Science – Unit 1 Lesson 9

Chemical Symbols and Formulas

Chemical Symbols

You have learned that an element is a PURE SUBSTANCE that is made of the same atoms

with definitive Physical and Chemical Properties. Chemical Symbols are used to identify each

element.

Each Chemical Symbol is an ABBREVIATION of the name of the element. The

abbreviation consists of one or two letters.

The names and symbols for the elements come from many sources including Latin and

Greek languages. For example, the symbol for silver is Ag because the Latin name for

silver is argentium. The symbol for mercury is Hg because the Latin name for mercury is

hydragyrum meaning liquid silver.

Table 1. Elemental Name and Chemical Symbol for Some of the First 20 Elements of the

Periodic Table

Atomic Number

Chemical Symbol

Elemental Name

Hydrogen

Helium

Carbon

Nitrogen

Oxygen

Sodium

Aluminum

Silicon

Chlorine

Potassium

Chemical Formula

Chemical Symbols can be combined to identify CHEMICAL COMPOUNDS.

Table salt is a compound composed of Sodium (Na) and Chlorine (Cl). The Chemical

Formula for table salt is NaCl. These two elements bond together because one element

gives an electron (Na) while the other element takes the electron (Cl). This type of bond

is called an IONIC BOND. In this example, one atom of sodium combines with one atom

of chlorine

Grade 9 Science Unit 1 Chemical Symbols And Formulas