Magnesium and calcium have similar chemical properties because their atoms in the ground state have
1.
equal numbers of protons and electrons
2
equal numbers of protons and neutrons
3
two electrons in the first shell
4
two electrons in the outermost shell
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the solar system used to have much dust particles option no d

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.