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阅读下面短文，用方框内所给词汇的适当形式填空，使短文语义完整。from I sit will like window friendly more not thinkOne sunny spring morning, Clark and I were 【1】 in the school library. Then I looked out of the 【2】 and saw Mr. White, my English teacher crossing the school yard. “I don’t want to meet him,” I said. “Why 【3】 ?” asked Clark. “He just doesn’t like me.” I explained.Clark thought for a second and said, “Maybe you’ve got it wrong. He probably 【4】 you don’t like him, so he’s not 【5】 to you. People like people who l在一个陌生的星球上充满了一种浅黄绿色的气体单质．科学家研究了该单质，确定其化学式是F2，相对分子质量为38．进一步研究表明：该元素的单质不导电；当该元素原子与金属元素原子化合时，只能形成F-：该元素原子与非金属元素原子化合时，只显一1价．试回答下列问题：（1）根据上面提供的信息判断，F元素属于     （填“金属“或“非金属“）元素，你的判断依据是    （2）科学家在该星球上还发现了另一种元素，确定其元素符号为Al，当Al原子与F原子化合时Al显+3价．则这种化合物的化学式为    ．