Nitrogen dioxide \((NO_2)\) is a dark reddish brown gas. It is present in the earth’s atmosphere. The colour is due to the absorption of the sunlight in the blue and green regions of the visible spectrum. It is not involved in global warming but it can form other pollutants that will contribute to global warming.
P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.