# Definition of chemical elements

1. Apr 4, 2005

### Leong

Is oxygen gas a chemical element?
Is oxygen atom a chemical element?
The oxygen element in the periodic table actually refers to an oxygen atom or oxygen gas that exist naturally in our surrounding air/atmosphere?
Thanks to anyone that help and try to explain.

2. Apr 4, 2005

### dextercioby

Ntzntz,conceptual quaestions... Open your text book & read the definition of a chemical element.See which option for $O_{2}$ fits the definition.

For the III-rd,u might remember the connection between Z,the element & the place in the periodic table.

Daniel.

3. Apr 5, 2005

### GCT

Oxygen in general is an element, oxygen gas is better referred to as a molecule. The oxygen mentioned on the periodic table refers to atom(s) of the element...