They will also be able to explain the meaning of atomic number and atomic mass. About this Lesson. Lessons 2 and 3 both use the 20 sheets of atom description cards – one sheet for each element.

The team of physicists from The University of Arizona say they were motivated by the possibility of Compact Ultradense ...

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.

Physicists have discovered that silicon-22 reveals a new proton magic number offering critical insights into nuclear ...