Question

which pair of elements would most likely form a covalent bond?
sodium and chlorine
iron and sulfur
calcium and bromine
hydrogen and oxygen
question 12 (1 point)
listen
in a chemical reaction, what are the starting substances called?
reactants
products
molecules
atoms

Explanation:

Covalent bonds form between non - metals by sharing electrons. Hydrogen and oxygen are both non - metals. In a chemical reaction, starting substances are reactants.

Answer:

For the first question: Hydrogen and oxygen
For the second question: Reactants