Valence Electrons Benchmark 5.

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Presentation transcript:

Valence Electrons Benchmark 5

Valence Electrons Electrons is the outermost energy level Involved in chemical reactions

How many valence electrons? Elements within a family have the same number of valence electrons, differing only in energy level! 30Zinc 1s22s22p63s23p64s23d10 84Po ________________6p4 12Mg 35Br 2He 38Sr

Electron Dot structures (lewis) A diagram showing valence electrons as dots. The inner electrons (core electrons) and atomic nuclei are represented by the symbol for the element Zn Po Mg Br N Cs *octet rule = atoms try to get 8 e- in their outermost energy level [except H, He, B, Be]

Anions & cations K O Cl Xe Sr N K+1 O-2 Cl-1 Xe Sr+2 N-3