This tells you the number of protons in an element. , atomic number, atomic mass, valence electrons, row/period, group/column, element key, This is the total of protons and neutrons combined. , atomic number, atomic mass, row/period, group/column, valence electrons, element key, This tells you how many energy levels / shells an element has. There are 7 of these. , atomic number, atomic mass, valence electrons, row/period, group/column, element key, These are the outermost electrons. In the farthest level from the nucleus. , atomic number, atomic mass, valence electrons, row/period, group/column, element key, Elements with same number of valence electrons are present in a. , atomic number, atomic mass, valence electrons, row/period, element key, group, Elements that are in the same one of these, share properties.  There are 18 of these. , atomic number, atomic mass, valence electrons, row/period, group/column, element key, Increasing atomic size of alkali metals. , Li, Na, K, Rb, K, Na, Li, Li, Be, B, C, In halogens F, Cl, Br, I. , Br is most reactive, F is most reactive, Number of shells in Potassium are. , 3, 2, 4, 5, This means it has properties of both metals and nonmetals. , conductivity, malleability, ductile, metalloids, Increasing order of number of electron shells for Ar, He, Ne, K, K, Ne, He, Ar, He, Ne, Ar, K, Ne, He, Ar, K, K, Ar, Ne, He, Increasing Ionisation Energy in 2nd period, O, N, C, B, Li, Be, B, C, B, Be, Li, C , C, B, Be, Li.

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