Labeling an Atom Reading off
A neutral atom possesses an atomic number of 13 and an atomic mass of 27 Three electrons are lost
From what region of the atom are they lost?
inside the nucleus
outside the nucleus
outside the atom
both inside and outside the nucleus

"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   the answer is c hope i'm right

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante