The atomic number of magnesium is 12.Find the number of electrons , protons and neutrons?

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

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

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.