In a sample of ethyl ethanoate $(CH_{3}COOC_{2}H_{5})$,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?
- AThe two oxygen atoms are isotopes
- BOne of the oxygen atoms has gained electrons
- COne of the oxygen atoms has gained two neutrons
- DThe two oxygen atoms are isobars
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Which of the following in the figure do not represent Bohr's model of an atom correctly?
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$(i)$ Atomic number $=$ number of protons $+$ number of electrons
$(ii)$ Mass number $=$ number of protons $+$ number of neutrons
$(iii)$ Atomic mass $=$ number of protons $=$ number of neutrons
$(iv)$ Atomic number $=$ number of protons $=$ number of electrons
$(i)$ Atomic number $=$ number of protons $+$ number of electrons
$(ii)$ Mass number $=$ number of protons $+$ number of neutrons
$(iii)$ Atomic mass $=$ number of protons $=$ number of neutrons
$(iv)$ Atomic number $=$ number of protons $=$ number of electrons
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| Column $A$ | Column $B$ |
| $(a)$ Ernest Rutherford | $(i)$ Indivisibility of atoms |
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| $(c)$ Dalton | $(iii)$ Concept of nucleus |
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| $(f)$ $E$. Goldstein | $(vi)$ Neutron |
| $(g)$ Mosley | $(vii)$ Canal rays |
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