Tag: atomic theory
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Class 9th – ATOMIC MASS OF AN ELEMENT
Atoms of elements are very small. To understand about atomic mass, it is a need to know about Carbon-12. Carbon-12 can be stated as no. of protons= 6 & no. of neutrons= 6 thus making it as 12. Carbon-12 atoms has been made as atomic mass of exactly 12 atomic mass unit. Earlier the unit…
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Class 9th – ATOMS AND MOLECULES
Atoms are indivisible particles which cannot be divided further. The Indian philosopher Kanada was the first to call that matter are made up of small particles called Parmanu. John Dalton called matter is made up of small particles called Atom. LAWS OF CHEMICAL COMBINATION: LAW OF CONSERVATION OF MASS LAW OF CONSTANT PROPORTION LAW OF…