Nowadays， we don't have enough resources to use. So it's everyone's duly to save them for the future. To save resources， we should __________.
①throw away a pencil without completely using it
②collect waste things for recycling
③go to school by kike instead of by car
④turn off the tap while brushing our teeth
⑤keep the lights on day and night
请你根据以下各元素的原子结构示意图判断，与氮元素具有相似化学性质是（ ）
