answer the following in brief...
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Answer:
(i) 1) All matter is made of atoms. Atoms are indivisible and indestructible. 3) Compounds are formed by a combination of two or more different kinds of atoms. 4) A chemical reaction is a rearrangement of atoms...
(ii) Though the plum pudding model proposed by J.J Thomson was able to explain the stability of atom; it could not satisfactorily explain the results of the gold foil experiment conducted by Rutherford. ... These were the reasons which led to rejection of Thomson's model of atom...
(iii) We now know that atoms are made up of three particles: protons, neutrons and electrons ...
(iv) The number of protons determines an element's atomic number and is used to distinguish one element from another. ... Together, the number of protons and the number of neutrons determine an element's mass number...
(v) An anion may be defined as an atom or molecule that is negatively charged. A cation may be defined as an atom or molecule that is positively charged. Anions and cations are both ions..