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 [Page 153]

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

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

Potassium sulphate

Calculate the number of molecules of sulphur (S₈) present in 16 g of solid sulphur.

What is meant by atomicity ? Explain with two examples.

Work out the formula for magnesium hydrogencarbonate.

Correct the following statement:

A molecule of sulphur is monoatomic.

Give one example of a polyatomic molecule.

Give a reason why –

Helium is considered monoatomic, but hydrogen a diatomic molecule.

State the atomicity of the following:

Sulphur

Which of the following is a triatomic molecule?

Give any two examples for heterodiatomic molecules.