isotopes

An atom is a very minute particle and so the actual mass of an atom is extremely small. It is physically not possible to measure such small masses easily. In 1811, Avogadro suggested that atomic and molecular masses can be expressed on an atomic mass scale relative to that of a standard reference ..

(iv) Berkelium (Bk) and Californium (Cf) (v) Nobelium (No) and Lawrencium (Lr) Bombardment with heavier nuclides produces these elements. Many of the heavier isotopes are short live..

(iv) Berkelium (Bk) and Californium (Cf) (v) Nobelium (No) and Lawrencium (Lr) Bombardment with heavier nuclides produces these elements. Many of the heavier isotopes are short live..

The age of fossils of plant or animal origin can be determined by carbon dating technique developed by Willard Libby in 1949. The radioactive isotope of carbon ( 6 C 1 4 ) is used to determine the date at which an animal or plant had died. Carbon Dating The method of measuring the a..

Symbol Cl Formula cl2 Atomic number 17 Electronic configuration 2, 8, 7 Valency -1 Relative Atomic Mass 35.5 Relative Molecular Mass 71 Vapor Density 35.5 Isotopes 35 37 Cl , Cl17 ..

Hydrogen combines with non-metals like carbon, silicon, etc. to from covalent compound like halogens. Examples: CH 4 and CCl 4 . Remember : In 1766, Henry Cavendish, an English chemist, discovered hydrogen, by treating iron with dilute sulphuric acid. He also proved that when hydrogen is bur..

Proposed by Dalton in 1803, this law states that: 'When two elements combine to form two or more compounds, then the different masses of one element, which combine with a fixed mass of the other, bear a simple ratio to one another'. This law is evident when one element combines with another to giv..

In spite of the above advantages, Mendeleev's periodic table suffered defects as follows: The position of hydrogen was not correctly defined. It was placed in group I although it resembles both the group I elements - the alkali metals and the group VII elements-the halogens, in their properties...

To control the fission process, rods made of cadmium or boron are suspended between the fuel rods. These rods can be raised or lowered and control the fission process by absorbing neutrons. That is why they are called 'control rods'. Controlling of neutrons is based upon the fact that cadmium and ..

Since it is not possible to calculate the weight of particles individually, a collection of such particles called mole is taken for all practical purposes. It was discovered that the number of atoms present in 12g of carbon of 12 C isotope is 6.023 x 10 23 atoms. This is referred to as Av..