Chemists use symbols to express elements easily, The symbol of any element is represented by its atom, The atom is the fundamental building unit of matter, It is the smallest individual unit of matter...
The modern periodic table consists of 7 periods (horizontal rows), and 18 groups (vertical columns), The elements are arranged ascendingly according to their atomic numbers and the way to fill their atomic energy sublevels...
Nitrogen gas is used in small amounts to fill some types of lamps, In incandescent light bulbs as an inexpensive alternative to argon, and it is used to store the petroleum liquified explosive and...
The halogens The halogens are located on the right side of the modern periodic table before the inert gases, The halogens are elements of group 7 A (17) in p-block, The halogens are mono-valent...
