Difference between revisions of "Relative Atomic Mass"

Revision as of 18:43, 2 January 2019

An element tile showing the mass number.

The Atomic Mass or mass number is the number of nucleons (protons + neutrons) in an atom.

Two atoms of the same element may have the same Atomic Number but a different Atomic Mass depending on the number of neutrons in the nucleus. Elements with different mass numbers are called isotopes.

The atomic mass is not affected by the number of electrons.

Only the particles in the nucleus affect the atomic mass.

Hydrogen	Helium	Lithium	Beryllium


Hydrogen has one nucleon so it has an atomic mass of 1.	Helium has four nucleons so it has an atomic mass of 4.	Lithium has seven nucleons so it has an atomic mass of 7.	Beryllium has nine nucleons so it has an atomic mass of 9.

@@ Line 30: / Line 30: @@
 | style="height:20px; width:200px; text-align:center;" |[[Helium]] has four [[nucleon]]s so it has an '''atomic mass''' of 4.
 | style="height:20px; width:200px; text-align:center;" |[[Lithium]] has seven [[nucleon]]s so it has an '''atomic mass''' of 7.
-| style="height:20px; width:200px; text-align:center;" |[[Beryllium]] has eleven [[nucleon]]s so it has an '''atomic mass''' of 11.
+| style="height:20px; width:200px; text-align:center;" |[[Beryllium]] has nine [[nucleon]]s so it has an '''atomic mass''' of 9.
 |}