Chemistry291

ATOMIC NUMBER (Z) The atomic number is the number of protons present in the nucleus of an atom or number of electrons revolving around the nucleus in an atom.  Based on the carbon standard the atomic mass of an element may be defined as the ratio between the mass of one atom of the element and 1/12th of mass of an atom of carbon Atomic number= No of protons=No of electrons MASS NUMBER (A) The mass number of an element is given by the total number of protons and neutrons present in the nucleus of an atom. A= (P+N) Therefore the number of neutrons is = A-Z. ISOTOPES The isotopes are atoms of the same elements having the same atomic number but different mass number. e.g. Isotope of oxygen:  8 O 16 , 8 O 17, 8 O 18. ISOBAR Isobars are the atoms of different elements having the same mass number but different atomic number. e.g.  92 U 234 , 91 Pa 234 Read More:What is Matter? Proton,Electron,Neutron

States of Matter/3 States of Matter/Solid,Liquid and Gas There are mainly 3 states of matter.These are solid,liquid and gaseous State.Besides, there is a another important state which is call plasma state. 3 State of Matter In solid state,the particles of the matter stay tightly.The inter molecular force is the highest and inter molecular distance the lowest.Example:Ice Read More In liquid state,inter molecular attraction force is relatively lower than solid.Here,Inter molecular distance increases.That is,inter molecular distance is more than that of  solid state. In gaseous state,inter molecular attraction force is very little.Inter molecular distance is increased to an extent that the molecules travel around freely and spread outside beyond the intermolecular attractions. Read More ...

What is Chemistry? Answer: Chemistry is an important brance of science.Chemistry is everywhere.The presence of Chemistry can be seen around us.Your rice,your clothes,your table are full of chemistry.You can't imagine a single day without Chemistry. Chemistry discuss the matter and its characteristics and It explains why  atoms combines with each other. You can say chemistry is the mother of science.           What is matter? What is Matter? Well, to understand chemistry, we have to have knowledge about matter. Do you know your body is matter,your table is matter and your chair is matter. Actually,the matter is that substance that has mass, volume and occupy space. If you divide matter,you will get electron,proton and neuton.This particle is not visible in a naked eye. Read More:States of Matter What is matter made up of? Answer: Matter is made up of particles.There are two types of particles.The first one is pe...