In a sample of ethyl ethanoate $(CH_3COOC_2H_5)$,the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?
- AOne of the oxygen atoms has gained electrons
- BOne of the oxygen atoms has gained two neutrons
- CThe two oxygen atoms are isotopes
- DThe two oxygen atoms are isobars
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The average atomic mass of a sample of an element $y$ is $35.5 \,u$. What are the percentages of isotopes $_{17}^{37}y$ and $_{17}^{35}y$ in the sample?
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$(b)$ Atomic number of an element $Y$ is $17$.
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$(iv)$ Is it a metal or non-metal?
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