What is the oxidation state of the central metal in [ni(en)3]so4?

How many atoms are in 1.4 mil of phosphorus trifluoride (pf3)

Identify a strong intermolecular force of attraction between an alcohol

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