A(n) has electro-negativity difference less than 1.2 between bonded atoms.
ionic compound
covalent compound
metallic compound
polar covalent compound

n has four pairs of electrons in the valence shell, electrons repel one another ,n has 7 protons in its nucleus, and since n has 7 protons, it must fill the second shell, giving it 4 pairs of electrons. the electrons form 3 bonds and 1 lone pair of electrons. each pair of electrons repels the other pairs, so they are equally far apart.

so all of the above

the dependant variable is spilled water

the independent is the heat