Which of the following states that an orbital can contain two electrons only if all other orbitals at that sublevel contain at least one electron?

a).archimedes' principle
b).aufbau principle
c).hund’s rule
d).pauli exclusion principle
e).le chatelier's principle

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

How many lone pairs of electrons are on the central atom of no3- and what is the molecular shape? one, trigonal planar zero, trigonal pyramidal zero, trigonal planar one, tetrahedral one, trigonal pyramidal

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table?