What was the significance of the ""dashes"" or blank spots on mendeleev’s original periodic table?

If i add water to oil what will happen

Which of the following statements about hybrid orbitals is or are true? choose all that apply. choose all that apply. under sp2 hybridization, the large lobes point to the vertices of an equilateral triangle. after an atom undergoes sp hybridization there is one unhybridized p orbital on the atom. the angle between the large lobes of sp3 hybrids is 109.5∘

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules