Nguyên tử A có phân lớp mức năng lượng ngoài cùng là 3p5. Nguyên tử B có phân lớp
mức năng lượng ngoài cùng 4s2. Xác định vị trí của A, B trong bảng tuần hoàn ?
 

1.a new computer will be bought by Jane
2.it will not be did by him
3.the new film will not be showed 
4.he will not be asked
5.the car will not be repaired by William
6.a question will be asked by me
7.you will be helped by his father tomorrow
8.the meeting will be holded
9.this machine mustn't be used
10.his parent will be visited by Tom next month
11.the test must be finished before ten
12.tea can't be made with cold water
13.our teeth should be cleaned twice a day