Chemicals symbols of elements are writed after the rules of IUPAC; see a list at the link below.
Chemical Symbol.
Because to write chemical equations you need a short way of referring to an element.
The correct chemical symbol of magnesium is Mg.
CO2
For correction purposes the correct way to write this is H2O and it is the chemical formula for water.
This chemical equation is:2 H2 + O2 = 2 H2O
Chemical symbol is code for a chemical element. Chemical formula is way of expressing information.
The correct way to write it is ' 120 '.The correct way to say it is "One hundred twenty".
reactants -----> products is correct
The correct way to write fireplace is as one word - "fireplace."
A chemical symbol is simply an abbreviated way of writing a particular chemical. The symbol is a much more convenient way of identifying each element. Some examples are "O" for oxygen and "H" for hydrogen.
the correct way is to simply write 3 and a colon following it then write down 2 zeroes followed by hrs