# How can you get determine an atomic number?

Jul 7, 2017

You can look at the periodic table.

#### Explanation:

The atomic number of any element is the number of protons one atom has in its nucleus. The periodic table of elements shows each element's atomic number; it is basically arranged in order of increasing atomic number.

For example, the atomic number of hydrogen (H) is 1, the atomic number of boron (B) is 5, etc.

Jul 7, 2017

The element number in the element box on the periodic table is the Atomic Number.

#### Explanation:

The Atomic Number of an element defines the number of protons in the nucleus of the specified element. For Oxygen, Atomic Number is 8 which means that all Oxygen atoms have 8 protons in their nuclei. For Uranium, the Atomic Number is 92 => $92 {p}^{+}$ in the Uranium nucleus.

Also, the atomic number is the basis for the 'Periodic Law' ...
"The chemical and physical properties of the elements are a periodic function of their Atomic Numbers."