Question

which pair of elements is most likely to form a molecule? calcium and oxygen sulfur and bromine sodium and calcium magnesium and hydrogen

Explanation:

Step1: Determine the type of bond

Molecules are formed by covalent bonds. Covalent bonds occur between non - metals.

Step2: Analyze each pair

• Calcium (Ca) is a metal, oxygen (O) is a non - metal. They form an ionic bond (not a molecule).
• Sulfur (S) and bromine (Br) are both non - metals. They can form a covalent bond (and thus a molecule).
• Sodium (Na) and calcium (Ca) are both metals. They do not form a covalent bond (not a molecule).
• Magnesium (Mg) is a metal, hydrogen (H) is a non - metal. They form an ionic bond (not a molecule).

Answer:

Sulfur and bromine