Elements in the same vertical column share similar chemical properties. which statement best explains this?
a. they have the same number of neutrons in their nucleus.
b. they have similar physical qualities.
c. they have identical numbers of electrons in the outermost level.
d. they were discovered in the same location.

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

What is the atomic number of an atom that has 6 protons

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?