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Lesson: Elements, Atoms, and Molecules

Worksheet • 8 Questions


What is the symbol for an atom of the element chlorine?

  • A C l
  • B C l +
  • C C l
  • D C l 2
  • E C l 2


Which of the following is true for molecules?

  • AMolecules are distinct, covalently-bonded collections of atoms.
  • BOnce you make a molecule out of atoms, you cannot get the constituent atoms back.
  • CAll molecules are composed of more than one type of atom.
  • DAll molecules are made of multiple atoms, all of the same type.
  • EMolecules have crystalline structures.


What is the difference between a sulfur atom and a sulfur molecule?

  • AA sulfur molecule consists of multiple sulfur atoms bonded together.
  • BSulfur atoms are reactive while sulfur molecules are not.
  • CSulfur atoms can be divided into smaller units, while sulfur molecules cannot.
  • DSulfur atoms consist of multiple sulfur molecules bonded together.


What is the symbol for molecular oxygen?

  • A O 2
  • B O 3
  • C O
  • D 2 O
  • E O 3


Which of the following best describes a molecule?

  • AAtoms chemical bonded together in a discrete unit
  • BA mixture of different elements
  • CA single atom of an element
  • DAtoms of two or more elements bonded together


Which of the following best describes an element?

  • AThe name shared by atoms containing the same number of protons
  • BAny of the fragments that make up a molecule
  • CA substance made from more than one type of atom
  • DA pure substance


Which of the following is not an element?

  • ASteel
  • BUranium
  • CIron
  • DMolybdenum
  • ECarbon


Which one of the following is true of an element?

  • AAll the atoms of an element have the same number of protons in their nuclei.
  • BAll elements are found in nature in their pure states.
  • CElements are made of at least two types of atom, bonded together.
  • DElements in the Periodic Table are arranged in order of increasing mass.
  • EYou can divide up an element into infinitely many pieces.