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Compound Names/Formulae

Across
The first element in the formula for methane
Besides chlorine the common element in a chlorate or hyperchlorite ion is..
The number of elements in ammonium nitrate
The name of a substance containing copper,sulphur and oxygen
The highest charge on a chromium ion
The ending of most two element compounds is...
Which of the following does not have a 2+ ionic charge: Ca,Ba,Li,Mg.
The number of charges on a carbonate ion
True or False: Hydrogen peroxide contains the same elements as water.
The number of ions in the formula for calcium chloride
Down
An element that can have a charge of 7+
The number of oxygens in the formula for sulphuric acid
An element common to iron oxide and calcium carbonate
True or false: Carbon dioxide contains ions
The charge on a sodium ion
The last element in the formula for ammonia
The number of elements in Potassium hydroxide
The charge on Fe in Iron(III)phosphate