Question

A Answer the following in not more than 20 words.
1. What does the formula of a substance tell you?
2. What do you mean by the valency of an element?
3. What is the following called?
A group of atoms of two or more elements behaving like an atom and having a valency
4. Name two elements that have variable valency. Give the formulae and names of two compounds
formed by each of these elements.
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Answer 1

Answer:

1.A chemical formula tells us the number of atoms of each element in a compound. It contains the symbols of the atoms of the elements present in the compound as well as how many there are for each element in the form of subscripts