6. Changing a SOLID to a LIQUID to a GAS requires

Energy (latent heat)

Explanation:

Latent heat of fusion for solid to liquid

Latent heat of vaporization for liquid to gas.

it requires the present of heat

Explanation:

when there is heat the solid will melt into liquid and from liquid when it is heated for example when water is heated it evaporate into vapor which is gas

"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."

i think its 100.

hope this !