9. Practice identifying elements, compounds, and mixtures by playing this game. Next, check the appropriate box for each of the substances below to identify whether each is a;
pure element,
a pure compound,
or a mixture.

Water
Oxygen Gas
Lemonade
Oil and Water in a Bottle
Iron
Methane Gas (CH4)
Salt (NaCl)
Graphite (made from
carbon atoms)

this is graded and timed pls hurry and help !!!

"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."

it's all four options.