Independent practice material. Not affiliated with the University of the Philippines and not official UPCAT content. Official UP Office of Admissions site

UPCATReviewer

UPCAT Science practice question 20: Noble gases are chemically unreactive mainly because they have

Correct answer

A. a complete outermost electron shell

A full valence shell leaves no strong tendency to gain, lose, or share electrons, so noble gases rarely form bonds.

Noble gases are chemically unreactive mainly because they have

  1. a complete outermost electron shellCorrect
  2. very large atomic radii
  3. no neutrons in the nucleus
  4. unusually high electronegativity

Why A is correct

A full valence shell leaves no strong tendency to gain, lose, or share electrons, so noble gases rarely form bonds.

Practice this section as a quizMore Chemistry questions

Same topic