Electronegativity is 1) The energy needed to remove valence electrons
2) the tendency of an atom to attract a bonding pair of electrons.
3) The energy absorbed by an atom to discharge an electron, resulting in a cation.
4) The energy released by an atom to gain an electron, resulting in an anion.

Electronegativity is the tendency of an atom to attract a bonding pair of electrons.

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.