- AThe nucleus is made up of protons and neutrons
- BThe number of electrons is exactly equal to number of protons in atom
- ✓The positive charge of the atom is concentrated in a very small space
- DElectrons occupy discrete energy levels
$(i)$ Most of the space inside the atom is empty because most of the alpha-particles passed through the gold foil without getting deflected.
$(ii)$ very few particles were deflected from thein path, indicating that the positive charge of the atom occupies very little space.
$(iii)$ A very small fraction of alpha-particles were deflected by $180^{\circ}$.
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$(a)$ Octahedral $Co(III)$ complexes with strong field ligands have very high magnetic moments
$(b)$ When $\Delta_{0}< P$, the $d-$electron configuration of $Co(III)$ in an octahedral complex is $t_{\text {eg }}^{4} e_{g}^{2}$
$(c)$ Wavelength of light absorbed by $\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}$ is lower than that of $\left[\mathrm{CoF}_{6}\right]^{3-}$
$(d)$ If the $\Delta_{0}$ for an octahedral complex of $\mathrm{Co}(\mathrm{III})$ is $18,000 \;\mathrm{cm}^{-1},$ the $\Delta_{\mathrm{t}}$ for its tetrahedral complex with the same ligand will be $16,000\;\mathrm{cm}^{-1}$