Quiz on Electronic Structure and Reactivity

Which of the following elements is not in the F block but was initially considered for having electrons in F orbitals?

• Uranium

• Oxygen

• Sulfur

• Argon

What is the electron configuration of an element with atomic number 16?

• 1s2 2s2 2p6 3s2 3p4

• 1s2 2s2 2p6 3s2 3p5

• 1s2 2s2 2p6 3s2 3p2

• 1s2 2s2 2p6 3s2 3p6

Which term describes elements that have the same electron configuration as argon?

• Isobars

• Isomers

• Isotopes

• Isoelectronic

Why are noble gases like argon considered to be chemically unreactive?

• They have high atomic numbers

• They are metals

• They have incomplete electron shells

• They have full electron shells

Which element is the least reactive among the following?

• Oxygen

• Sulfur

• Uranium

• Argon