①电子排布在同一能级时，总是优先单独占据不同轨道,且自旋方向相同

②电子排布在不同能级时，总是优先占据能量低的轨道，然后再占据能量高的轨道

③电子排布在同一轨道时，最多只能排2个，且自旋方向必须相反

④电子的排布总是遵循“能量最低原理”“泡利不相容原理”和“洪特规则”

阅读理解

Everybody wants to be healthy. You know food is very important. There are lots of healthy food. You can have more bananas, apples, oranges, tomatoes and lettuce because fruit and vegetables are good for you. But don’t eat too much chocolate. It’s not healthy food. Healthy food can make you grow (生长) and make you strong（强壮的） and happy. Remember there is a saying—“An apple a day keeps the doctor away（远离）”. Sports can also keep you healthy. Get up early and do some sports every day. Don’t be lazy（懒惰的）. You will be healthy and happy.