Mastering Electron Configurations and Periodic Table Insights

What is the primary tool used to determine electron configurations?

• Molecular structure

• Periodic table

• Chemical reactions

• Atomic mass

Which block does helium belong to in the periodic table?

• d-block

• p-block

• f-block

• s-block

How many electrons are in the 2p state for a carbon atom?

• 1

• 2

• 3

• 4

What is the electron configuration for sulfur?

• 1s2 2s2 2p6 3s2 3p6

• 1s2 2s2 2p6 3s2 3p4

• 1s2 2s2 2p6 3s2 3p2

• 1s2 2s2 2p6 3s2 3p5

What does the principal quantum number (n) indicate?

• The energy level of the electron

• The spin of the electron

• The type of orbital

• The shape of the orbital

Which quantum number describes the shape of the orbital?

• Principal quantum number (n)

• Angular momentum quantum number (l)

• Magnetic quantum number (m)

• Spin quantum number (s)

What is Hund's rule?

• Electrons fill degenerate orbitals singly before pairing

• Electrons in the same orbital must have opposite spins

• No two electrons can have the same set of quantum numbers

• Electrons fill the lowest energy orbitals first

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

• 2p

• 3s

• 1s

• 2s

Why is potassium highly reactive?

• It has a full outer shell

• It has a high number of protons

• It has a single electron in its outermost shell

• It has a high atomic mass

What happens to potassium's electron configuration during a reaction?

• It loses its final electron

• It gains a proton

• It gains an electron

• It remains unchanged