Atomic Number and Atomic Mass: Get here the easy notes on atomic number and atomic mass for all the first 30 elements. Know how to calculate atomic mass using atomic number.

Carbon atoms have six protons, so its atomic number is six. Elements also each have a unique atomic mass. The atom's mass primarily comes from the protons and neutrons in the atom's nucleus.

The relative atomic mass is the mass of an atom compared with that of the 12 C isotope close isotope Atoms which have the same number of protons (so they are atoms of the same element and have the ...

Descriptions and links to a large number of chemistry simulations, with peer review ratings and comments, and information on appropriate grade levels. Chemistry Simulations from CK-12 A collection of ...

Langevin approach developed by an international team of researchers, including members from Science Tokyo, accurately reproduces complex fission fragment distributions and kinetic energies in ...

Middle School Chemistry. Lesson Plans Chapter 1 : Matter—Solids, Liquids, and Gases 1.1: Molecules Matter; 1.2: Molecules in Motion; 1.3: The Ups and Downs of ... The extra mass makes copper more ...