How many moles of sodium (na) do you have in a sample of 9.8 × 10^23 atoms na?
0.61 mol na
1.6 mol na
5.9 mol na
16.3 mol na

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