Dihydrogen

What is the atomic number of hydrogen?

Why does hydrogen exist as a diatomic molecule while all alkali metals exists as monoatomic molecules?

 Why hydrogen is more electronegative than sodium?

Why is the ionisation enthalpy of hydrogen higher than that of sodium?

Compare hydrogen with alkali metals on the basis of nature of compounds.

The position of which of the following elements is debatable?

The present position of hydrogen in the modern periodic table is completely justifiable.

Explain the reason behind controversial position of hydrogen in the periodic table.

Consider the following statements.

(i) The most common isotope of hydrogen is protium.

(ii) Water-gas shift reaction is a multistep reaction.

(iii) ${\mathrm{D}}_2\mathrm{O}$ has a higher boiling point than ${\mathrm{H}}_2\mathrm{O}$.

Which of the above statements is/are true?

The most abundant element in the universe is:

Compounds of carbon and hydrogen are called as

Where can we found hydrogen in free state?

The most abundant element in the universe is:

_____ is the most abundant element in the universe.

What are the natural sources of hydrogen gas?

Consider the following statements.

(i) The most common isotope of hydrogen is protium.

(ii) Water gas shift reaction is a multi step reaction.

(iii) ${\mathrm{D}}_2\mathrm{O}$ has higher boiling point than ${\mathrm{H}}_2\mathrm{O}$

Which of the above statements is/are true?

Justify the position of hydrogen in the periodic table on the basis of similarity and dissimilarity with alkali metals and halogens.

Give two properties in which hydrogen neither resembles with alkali metals nor with halogens.

Justify the position of hydrogen in the periodic table on the basis of its electronic configuration.

Name an isotope of hydrogen which has same number of proton and neutron.