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Atomic Structure

Below are more examples of
balanced chemical equations showing state symbols.

sodium + oxygen        sodium oxide.  
4Na_(s)  +    O_2(g)              2Na₂O_(s)  

aluminium + chlorine  aluminium chloride.
2Al_(s)  +    3Cl_2(g)                2AlCl_3(s)

aluminium + oxygen      aluminium oxide.
4Al_(s)  +    3O_2(g)              2Al₂O_3(s)

calcium + chlorine     calcium chloride.
Ca_(s)  +    Cl_2(g)              CaCl_2(s)

magnesium + bromine     magnesium bromide.
Mg_(s)  +    Br_2(g)                  MgBr_2(s)

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