Which statement best explains why radon and krypton do not bond easily with other elements?
they have many electron shells, so their protons do not attract electrons strongly. they have eight electrons in their valence shells, so they are stable without gaining or losing electrons. their valence shells are empty, so they do not need to bond with other elements to be more stable. their valence shells are so close to the protons in the nucleus that bonding cannot happen like in other elements.

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."