(1) 원자가 전자는 원자가 가진 전자들 중에서 최외곽에 있는 전자를 말하는데 이 전자들의 원자간 이동 혹은 상호공유로 화학결합이 이루어 집니다. 일반적으로 최외곽 전자가 8개가 되도록 결합이 이루어 지는데 수소의 경우는 예외적으로 최외곽 전자가 2개가 되도록 결합합니다.
수소와 탄소의 경우 원자가 전자(최외곽 전자)는 각각 1개, 4개입니다.
(2) 대개 단일 결합에 사용되는 전자는 한쌍(2개)이 사용되고 이중결합의 경우에는 두쌍(4개)의 전자가 사용되어 결합을 이룹니다.
(3) C2H4는 에틸렌으로 탄소와 탄소끼리 2중결합으로 이루어지면서 모두 4개(각원자당 2개)의 전자가 C=C간 이중결합에 사용되고 각 탄소가 가진 나머지 원자2개는 수소원자 2개가 각각 전자 하나씩 공유하여 결합합니다.
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