4. In the molecules CH, NH3 and H2O, the bond angles are as follows: H-C-H
H-N-H
H-O-H
109.5°
107°
104.5°
All of these molecules have four pairs of electrons arranged around the central atom in a
tetrahedral arrangement. Explain why the bond angles are different.

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

What is the correct equation for cellular respiration?

What can be found in the ionosphere