Question

The lightest element of the world is:
A. Oxygen
B. Helium
C. Hydrogen
D. Chlorine

Answer 1

Hint: Hydrogen is an exceptionally combustible gas (\[{H_2}\]) and the most well-known segment of the universe. It is the lightest component ever and is drab, scentless, and bland. It's likewise in most natural mixes.

Complete step by step solution:
> Hydrogen, H, is odourless, dreary, bland, and non-metallic component with the nuclear 1, and it's additionally generally 75% of the universe's mass. It's additionally the most bountiful concoction component on the occasional table. Hydrogen(H) is a gas, and is the principal component on the occasional table. It needs shading, taste, or smell, and is profoundly combustible.
> Its subatomic equation is \[{H_2}\]. Hydrogen (represented by H) is one of the components. Its nuclear number is 1 and it is a vapid, bland, unscented non-metallic gas. Hydrogen is exceptionally combustible. Furthermore, is the lightest of the considerable number of components. Hydrogen, or \[{H_2}\], is an essential gas present in the following sum in earth’s environment. Hydrogen is to some degree responsive due to its combustibility. > It is utilized as a part in manure and petroleum derivatives.
> Hydrogen, H, nuclear number one, is the lightest component. Hydrogen makes up around 75 percent of the universe's basic mass. \[{H_2}\], its diatomic gas, is utilized to redesign non-renewable energy sources and make smelling salts.

The correct answer is C.

> Hydrogen, \[{H_2}\], is an essential gas with a nuclear mass of 1.00794. This diatomic atom is the lightest and most bountiful component known to man. It is additionally drab, unscented, and exceptionally combustible. Hydrogen; Hydrogen, \[{H_2}\], is the most bountiful component in the universe.

Note: Hydrogen bonding takes place when any atom goes through a dipole-dipole interaction of a very electronegative atom most of the times the bonding between hydrogen occurs with fluorine oxygen and nitrogen which are known as FON-elements.