Question

Select each correct answer. More than one answer may be correct. Four atoms of hydrogen combine with one carbon atom to form CH4, but only two hydrogen atoms combine with one oxygen atom to form H2O. Which of the following helps to explain why? Hydrogen has one valence electron. Metallic bonds form between positively charged metal ions and delocalized electrons. Atoms may share electrons in order to fill their electron shells. Oxygen has two vacancies in its electron shell, but carbon has four vacancies.

Answer 1

It’s the mentioning the amount of valence electrons in hydrogen, and the one about electrons share electrons to fill their shells.