## What is the atomic number of the element oxygen?

8
Oxygen/Atomic number

How many elements make up oxygen O2?

two atoms
Oxygen is represented by the chemical symbol O. In the air, oxygen exists mostly as molecules each made up of two atoms (O2), although small amounts of ozone (O3), in which three atoms of oxygen make up each molecule, are present in the atmosphere.

### What are the atomic number of element?

number of protons
The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

How many protons and electrons does oxygen have?

Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. The chemical symbol for Oxygen is O. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.

## What is the chemical symbol for oxygen?

The chemical symbol for Oxygen is O. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. The nucleus is composed of protons and neutrons. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z.

What is the atomic mass of oxygen?

Oxygen has 8 protons, while the number of neutrons it has is also 8. This implies that the mass number of Oxygen is 8+8, that is 16. Since the mass of an electron is approximately negligible, the element’s atomic mass is almost equal to its mass number. Atomic mass is measured in terms of atomic mass unit.

### What is the atomic number of an element?

The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).