Atomic models have been improved over the years. Arrange the following atomic models in their chronological order:
$(i)$ Rutherford's atomic model
$(ii)$ Thomson's atomic model
$(iii)$ Bohr's atomic model
$(i)$ Rutherford's atomic model
$(ii)$ Thomson's atomic model
$(iii)$ Bohr's atomic model
- A$(i), (ii)$ and $(iii)$
- B$(ii), (iii)$ and $(i)$
- C$(ii), (i)$ and $(iii)$
- D$(iii), (ii)$ and $(i)$
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$(a)$ Name the three subatomic particles of an atom.
$(b)$ An atom of an element has $5$ electrons in the $L$ shell.
$(i)$ What is the atomic number of the element?
$(ii)$ State its valency.
$(iii)$ Identify the element and write its name.
$(b)$ An atom of an element has $5$ electrons in the $L$ shell.
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$(ii)$ State its valency.
$(iii)$ Identify the element and write its name.
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