Write Lewis symbols for the following atoms and ions :
S and `S^(2-)`, Al and ` Al^(3+)`, H and `H^-`

Write Lewis dot symbols for atoms of the following elements : Mg, Na, B, O, N, Br

Define the following terms phase of S.H.M.

Draw Lewis dot diagrams for the following Hydrogen (H_2)

Draw Lewis dot diagrams for the following Water (H_2O)

Draw the Lewis structures for the following molecules and ions: H_2 S , SiCl_4 , BeF_2 , CO_3^(2-) , HCOOH

Draw. Lewis dot diagrams for the following Water (H_2O)

Draw. Lewis dot diagrams for the following Hydrogen (H_2)

Define the following terms period of S.H.M.

Define the following terms amplitude of S.H.M.

Define the following terms epoch of S.H.M.