An Element a Forms an Oxide A2o5. What is the Valency of Element a ?

An element A forms an oxide A2O5.

What is the valency of element A ?

Short/Brief Note

Element A forms an oxide A₂O₅. Crossing the valencies, we can see that the valency of O (oxide) is −2 and that of element A is 5.

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Chapter 3 Atoms and Molecules
Very Short Answers | Q 46.1 | Page 153

Write down the name of a compound represented by the following formula:

Al₂(SO₄)₃

Write down the name of a compound represented by the following formula:

K₂SO₄

Give the name of the element present in the following compound:

Quick lime

What do the following denote ?

Why are the symbols and formulae of substances important?

Give one example of a triatomic molecule

Give a reason why –

Ozone is considered triatomic, but phosphorus a tetratomic molecule.

State the atomicity of the following:

Oxygen

Give any two examples for heterodiatomic molecules.

Which of the following contains maximum number of molecules?