ncert solution of chemistry class 9 ch 4
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14 a)f b) false c)t d) false; 15 atomic nucleus; 16) different number of neutron 17) 8;18)2,8,1;19) please look the answer of this on the text
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When the liquids between the two ends of the tester allow the electric current to pass the circuit of the tester begins complete the current flows in the liquid circuit and the bulb glows when the liquid does not allow the electric current to pass the circuit of the test is not completed and the bulb does not glow
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