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Fill in the blanks.(a) Dalton............ that atoms could not be divided(b) An ion which has a positive charge is called a............. (c) The outermost shell of an atom is known as................ (d) The.................. of an atom is very hard and dense.(e) Neutrons are............... particles having mass equal to that of protons.(f) Isotopes are the atoms of................ element having the same atomic number but a different mass number. |
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Answer» (a) Dalton said that atoms could not be divided (b) An ion which has a positive charge is called a cation. (c) The outermost shell of an atom is known as valence shell. (d) The nucleus of an atom is very hard and dense. (e) Neutrons are neutral particles having mass equal to that of protons. (f) Isotopes are the atoms of an element having the same atomic number but a different mass number. |
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