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Atomic number- The number of protons in the nucleus of an atom
Atomic mass unit- The mass unit of (u) an isotope based on standard of the carbon –12 isotope, which is defined as a mass of exactly 12.00 u; one atomic mass unit is 1/12/ the mass of a carbon -12 atom.
Atomic weight- average of the masses of stable isotopes of an element as they occur in nature, based on abundance of each isotopes of the element and the atomic mass of isotope compared to carbon -12
Electron shell- ism a setoff atomic electronic grouped together by their quantum energy level.
Isotope- atoms of an element with identical chemical properties but with the different masses; isotopes are atoms of the same element with different numbers of neutrons.
Ionic compound- chemical compound that are held together by ionic bonds; that is, bond of electrostatic attractions between negative and positive ions.
Covalent bond- a chemical bond formed by sharing of a pair of electrons
Covalent compound- chemical compound held together by a covalent bond or bonds.

The families and groups are important because they classify the different elements. Also, because there are so many elements, there needs to be a system to organize them. The group number is an identifier used to describe the column of the standard.

3 A. H (1) = 1.008, Li (1)= 6.941 Na(1) =22.99 B. Be (2) =9.012 & Mg (2) =24.31

C 13) =10.81 Al (13) =26.98 D. He( 18)= 400.3 Ne( 18)= 20.18 Ar(18)=39.98
4. The number of shell are increased by

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