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ATOMS AND MOLECULES, IONS, IONS, IONIC COMPOUNDS, RULES OF WRITING CHE…
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IONS
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NH4+ ,CO3^2- ,SO4^2-, NO3- ,OH-
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RULES OF WRITING CHE,MICAL FORMULA
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MOLECLAR MASS
MOLECULAR MASS OF A SUBSTANCE IS ITS RELATIVE MASS AS COMPARED WITH THE MASS OF A C 12 ATOM TAKEN AS 12 UNITS
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SOME NOBLE GASSES CAN EXIST IN FREE STATE BUT OTHER ELEMENTS ARE VERY REACTIVE SO THEY EXIST IN THE FOLL WAYS
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