⑴After I get up, I brush my teeth.
⑵Before I have breakfast, I wash my face and hands.
⑶After I have breakfast, I walk to school.
⑷Before I have dinner, I do my homework.
⑸After dinner, I watch TV.
____
短周期主族元素M、N、X、Y、Z的原子序数依次增大.又知M与X同主族,N原子的最外层电子数是电子层数的3倍,M原子的原子半径小于N原子的原子半径,Z的原子半径在同周期元素中是最小的,Y原子的电子层数与最外层电子数相等.下列叙述正确的是( )