Which phrase describes a valence electron?(1 point) an electron in the innermost orbit of an atom

an electron that has been removed from an atom

any negatively charged particle in an atom

an electron in the outer energy level of an atom

List four observations that indicate that a chemical reaction may be taking place

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.

Main expenses you plan on making payments on a new car too. you want to spend 15% of your monthly net pay on the car payment, insurance, registration, and taxes combined. what is your monthly car allowance? $149.46 $298.91 $448.37 $597.83