The systematic pattern for filling up the electron configuration, from low energy to high energy for an element is called the: a) the Pauli exclusion principle.
b) Hund's rule.
c) Coulomb's law the Aufbau principle.
d) the Heisenberg uncertainty principle.

 The Aufbau principle.

Explanation:

According to aufbau's principle of filling electronic orbitals, the sublevels with lower energies are filled up before those with higher energies. The orbitals with lower (n+l) value will be filled prior to higher (n+l) value.

Hunds rule states that an orbital can contain two electrons only if all other orbitals in that sublevel contain at least one electron.

Paulis exclusion principle states that two electrons must have opposite spin , which means that no two electrons can have same set of quantum numbers.

Heisenberg principle states that it is impossible to measure simultaneously the exact position and momentum of subatomic particle.

3 1/4 %

explanation:

there are two significant figures.