A cylindrical rod made of graphite (a form of carbon) is 16.8 cm in length and has a mass of 2.17 kg. The density of graphite is 2.26 g/cm3. What is the diameter of the graphite rod, in cm?

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

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

i'm wiling to try and you : )