key concepts

It refers to the similarly in the properties of some of the elements of 2nd period to diagonally opposite elements of 3rd period. The pair of elements showing diagonal resemblance are: LiMg, Be..Al and B.S..

It is not possible to measure simultaneously both the position and velocity (or momentum) of a microscopic particle with absolute accuracy or certaint..

Biodiversity is not uniformly distributed across the geographical regions of the earth. Norma Myers developed the hot spots concept in 1988 to designate priority areas for in-situ conservation. The hot spots are the richest and the most threatened reservoirs of plant and animal life on ea..

Angiosperms represent the most recent and the most advanced group of plants. Angiosperms have been of immense importance to humans, more than any other group. There have been several attempts to classify angiosperms. One of the earliest attempts was that of Carolus Linnaeus. He was the f..

Oersted's experiment shows that a current carrying wire exerts a force on a magnetic needle and deflects it from its usual north-south position. The reverse must also be true, which was proved by the French scientist Andre Marie Ampere, who suggested that a magnet must also exert an equal and oppo..

; it is the result of trying to force two objects to occupy the same space. Steric interaction As the dihedral angle between the methyl groups approaches 0, the energy maximum is reached. Since the methyl groups are forced even closer together than in the gauche conformation, a large amount of ster..