The atomAn Atom: The most basic unit of matter.An atom has a dense nucleus and a cloud of negatively charged electrons around it. If matter is what everything is made of, and matter is made of atoms… Then, everything is really made of atoms!
An ElectronElectron: A subatomic particle with a negative electrical charge.An electron’s mass is so small that it is generally not even considered.
A NucleusNucleus: The dense center of an atom containing protons and neutrons. Nucleus
A ProtonA Proton: A subatomic particle within the nucleus of an atom that has a positive charge.
NeutronA Neutron: A subatomic particle within the nucleus of an atom that has a neutral charge.
Energy LevelThe energy level of an atom is as follows:2,8,8 The first shell has two electrons The second shell has 8 electrons The third shell has 8 electrons MEMORIZE: 2,8,8!!!!!!!!!!
Atomic NumberThe atomic number is the number mainly associated with the element and represents the number of protons present in the atom.
Mass NumberThe total number of protons and neutrons.The mass of an atom comes from the protons and neutrons. Therefore, the mass includes the masses of each added together. This number can be found Mass Number at the bottom, typically.
Atomic MassSub atomic particles are measured in AMU’s. AMU stands for Atomic Mass Unit.Every proton has a mass of 1 AMUEvery Neutron has a mass of 1 AMURemember, electrons don’t have a measureable mass.
ElementA pure chemical substance consisting of ONE type of atom.