KERALA PSC / CHEMISTRY / ATOMS AND MOLECULES / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

 

KERALA PSC / CHEMISTRY / ATOMS AND MOLECULES / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

KERALA PSC / CHEMISTRY / ATOMS AND MOLECULES / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

·      The term ‘atom’ was introduced by Ostward, means indivisible

·      Atoms are the smallest units of matter that have all the characteristics of an element. Atoms are the building blocks of everything in the universe

·      Atoms cannot exist freely as such

·      They exist in combination with the atoms of the same element or another element

·      Only atoms of noble gases like Helium, Neon, Argon and Krypton are unreactive and exist in the free state.

·      The structure of atom was discovered by Niels Bohr

·      The first atomic theory was postulated by John Dalton in 1808, a poor English School master

·      Plum Pudding (water melon) model of atom was suggested by J.J Thomson

·      A combination of atoms is called molecules

·      All substances are made of tiny particles called molecules

·      A molecule is the smallest particle of a substance than can exist independently

·      The term molecule was introduced by Avogadro

KERALA PSC / CHEMISTRY / ATOMS AND MOLECULES / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY