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.

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 atomic number of an element tells you how many protons close proton Subatomic particle with a positive charge and a relative mass of 1. The relative charge of a proton is +1. that the element has.

The periodic table’s arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius. Many scientists worked on the ...