On a mission to a newly discovered planet, an astronaut finds copper abundances of 69.15 % for 63cu and 30.85 % for 65cu. what is the atomic mass of copper for this location? the mass of 63cu is 62.9300 amu . the mass of 65cu is 64.9200 amu .

"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."

they are all solids.