Why does the mass number equal the total number of protons and neutrons? and what is mass number of atoms expressed in the periodic table?

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 of the following molecules is polar? c3h7oh c2h5cooh

Which of the following is a chemical property of water at 4 c