2.3-Elements and Compounds - 3

There are ____ periods in the periodic table.

• 5

• 6

• 7

• 8

Example of a chemical formula of water is ____.

• HO

• O₂

• H₂

• H₂O

Example of a chemical symbol of Hydrogen is ____.

• Hg

• He

• HO

• H

We use ____ to represent compounds.

• Equations

• Numbers

• Chemical Formulas

• Symbols

The vertical column of the periodic table is called ____.

• Row

• Period

• Group

• Series

The horizontal row of the periodic table is called ____.

• Series

• Group

• Period

• Range

All the known elements are organized in a special table, called ____.

• Biological Table

• Chemical Table

• Physical Table

• Periodic Table

We use ____ to represent elements.

• Chemical formulas

• Numbers

• Symbols

• Shapes