Why does the electronegativity get smaller as you move from an element with a lower atomic number to an element with a higher atomic number within a group but larger when you move from an element with a lower atomic number to a higher atomic number within a period?

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule

Which of the following words describe the reality that the universe looks the same from various perspective