One of your classmates draws an electron dot diagram for a helium atom with two dots. He tells you that these dots mean each helium atom has two unpaired electrons and can gain,
lose, or share electrons to have four pairs of valence electrons and become stable. What is
wrong with your classmate's argument?

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

Connect the whole numbers on the periodic table to indicate what they represent?

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n