Going across the periodic table (the coloumns) is known as:

Going down the periodic table (the rows) is known as:

Provide the symbol for this element: Magnesium

The elements in Group 18 are known as:

Hydrogen:

He: This is the symbol for:

Be:

Lithium:

Sodium:

Argon:

Si: This is the symbol for:

The symbol for this picture is:

F: This is the symbol for:

The symbol for the element that is used in swimming pools