You should never put a lone pair of electrons on a atom when it is in a covalently-bonded compound. You very rarely put a lone pair of electrons on a atom when it is in a covalently-bonded compound.

What does the cell nucleus do or, how does it function?

One of the few xenon compounds that form is cesium xenon heptafluoride (csxef7). how many moles of csxef7 can be produced from the reaction of 13.0 mol cesium fluoride with 12.5 mol xenon hexafluoride? csf(s) + xef6(s) csxef7(s)

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space