Exploring Electron Configuration and Orbital Notation

What are the two ways to indicate the location of electrons in an atom?

• Electron configuration and molecular geometry

• Electron configuration and orbital notation

• Electron configuration and Lewis structures

• Orbital notation and Lewis structures

In a neutral atom, what does the number of protons equal?

• Number of electrons

• Number of orbitals

• Atomic mass

• Number of neutrons

According to the Aufbau principle, which orbital is filled first?

• 2s

• 2p

• 1s

• 3d

What does the superscript number in an electron configuration indicate?

• Sublevel

• Energy level

• Number of electrons in the sublevel

• Number of protons

Why is the 3d sublevel filled after the 4s sublevel?

• Because 4s has lower energy than 3d

• Because 3d has lower energy than 4s

• Because 3d can hold more electrons

• Because 4s can hold more electrons

What is the correct electron configuration for copper (element number 29)?

• 1s2 2s2 2p6 3s2 3p6 4s2 3d9

• 1s2 2s2 2p6 3s2 3p6 4s2 3d10

• 1s2 2s2 2p6 3s2 3p6 4s1 3d10

• 1s2 2s2 2p6 3s2 3p6 4s2 3d8

What does the Pauli Exclusion Principle state?

• Electrons fill orbitals of lowest energy first

• Electrons fill each orbital singly before pairing

• Electrons in the same orbital must have the same spin

• Each orbital can hold up to two electrons with opposite spins

According to Hund's rule, how are electrons placed in orbitals of the same sublevel?

• Electrons are placed in the highest energy orbital first

• Each orbital is filled with one electron before any are paired

• All orbitals are filled with two electrons first

• Electrons are placed in the lowest energy orbital first

How many valence electrons does potassium have?

• Four

• Three

• One

• Two

In which sublevels are the valence electrons of bromine located?

• 3p and 4s

• 3d and 4s

• 4p and 5s

• 4s and 4p