What is electronegativity?

a. a measurement of the ability of an atom to attract a proton

b. a measurement of the ability of an atom to attract a neutron

c. a measurement of the ability of an atom to attract an electron

d. a measurement of the ability of an electron to attract another electron

Can someone me with these questions plz.

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

If an atom has 12 protons and 13 neutrons