Question

Which position for hydrogen explains all its properties
A. At top of halogen
B. At top of alkali metals
C. At top of C family
D. None of these

Answer 1

Hint: The first element of the periodic table is hydrogen with atomic number 1 having one electron in its outermost shell. Elements are placed in the periodic table on the basis of electronic configuration.

Complete Step by Step Answer:
Hydrogen resembles many elements on the basis of their properties.
It resembles halogens ($F, Cl, Br, I$) as both are non-metals. Hydrogen acts as a diatomic molecule just like halogens. The ionisation energy of hydrogen and halogen is almost similar with the ionisation energy of hydrogen slightly higher. Just like halogens, hydrogen loses one electron to form a $H-$ ion. When electrolysed, H is liberated at anode during electrolysis of $NaH$, in the same way $Cl$ is liberated at anode during the electrolysis of $NaCl$.

Hydrogen resembles alkali metals as they lose one electron to form a unipositive ion. It also acts as a strong oxidising agent like alkali metals. It has an oxidation state of $+1$.

Elements belonging to the carbon family are: Carbon, silicon, germanium, tin and lead. Hydrogen resembles the carbon family as they have similar electronegativity and ionisation potential. Thus the position of hydrogen is not justified in the periodic table due to its resemblance to many elements of different groups.
Thus, the correct answer is option is D: none of these

Note: Hydrogen is classified as a non-metal as it shows many properties of nonmetals. It is a gas at room temperature. Hydrogen also conducts electricity in liquid form due to its resemblance with alkali metals. Hydrogen is used in the study of superconductors and is an excellent rocket fuel when it is combined with liquid oxygen.