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- The toy should be attractice ,safe and simple to use
- Safety is important for selecting toy as a child under 2 to 3 yrs is very small and we should be taken care about them that we should provide only that toys to them from which they didnt get any harm.
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Thomson proposed that the nucleus of an atom contains only nucleons. (B) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral. (C) The mass of an electron is about 1/2000 times that of proton.
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