How many dots are shown in the electron dot diagram for calcium, in group ii and period 4 with 20 protons and 20 electrons? a. four c. eight b. two d. twenty

The variability in marine salinity between habitats does not impact the fish living there. select the best answer from the choices provided t f

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

What is the molar mass of potassium nitrate, kno3