Bài 1: nguyên tố X có công thức với hidro là H₂X, trong đó X chiếm 94,12% về khối lượng. Xác định nguyên tố X và vị trí trong bảng tuần hoàn
Bài 2: sắp xếp các nguyên tố sau theo chiều tính phi kim tăng dần: Al, F, Cl, Mg, P. Giải thích?

Bài 2: Nguyên tố A có số liệu nguyên tử là 20 chu kì 4 trong bảng nhóm II trong bảng tuần hoàn nguyên tố.Hãy cho biết.
a, Cấu tạo của nguyên tử
b, Tính chất hóa học đặc trưng của A
c, So sánh tính chất hóa học của A với nguyên tố lân cận

Bài 1: nguyên tử nguyên tố X có hạt nhân là 17+ , có 3 lớp electron và có 7 electron lớp ngoài cùng .Xác định vị trí X trong bảng tuần hoàn

Bài 2: Nguyên tố A có số liệu nguyên tử là 20 chu kì 4 trong bảng nhóm II trong bảng tuần hoàn nguyên tố.Hãy cho biết.
a, Cấu tạo của nguyên tử
b, Tính chất hóa học đặc trưng của A
c, So sánh tính chất hóa học của A với nguyên tố lân cận
Bài 3: cho 3,72 gam hỗn hợp X gồm 2 kim loại thuộc 2 chu kì liên tiếp nhau trong nhóm I A tác dụng với H₂O dư. Sau phản ứng thu được 1,344 lít khí H₂(đttc) .Xác định 2 kim loại trong X và tính phần trăm khối lượng của mỗi kim loại.

IV. Rewrite                                                    

1. This is the first time she has eaten eel soup.
= She has not……………………………………………………….………………………………..
2. She began to write 30 minutes ago.
= She has……………………………………………………………………………………………
3. They started studying English when they were in grade 3.
= They have…………………………………………………………………………………………..
4. I last saw him 3 weeks ago.
= I haven’t…………………………………………………………………………………………..
5. The last time I watched this movie was 6 months ago.
= I haven’t……………………………………………………………………………………………
6. It is a long time since she last saw her parents.

= She ……………………………………………………………………………..
8. This is the first time I have been abroad.
= I …………………………………………………………..
9. I haven’t gone to the zoo since last year.
= The last …………………………………………………………………….
10. I haven’t met my aunt since I was 10 years old.
=  I last ……………………………………………………………………

11. This is the first time she has worked with foreigners.
= She hasn’t…………………………………………………………..
12. She started to cry two hours ago.
= She has…………………………………………………….

III.Mark the letter A, B, C, or D on your answer that best combines each pair of sentences in the following questions.

46. “Do you know Long’s address?” he asked me.

A. He asked me for Long’s address.                                         B. He asked me if someone knew Long’s address.

C. He asked me if I know Long’s address.                               D. He asked me if I knew Long’s address.

47. They are building a new bridge over the river.

A. A new bridge is building over the river.                             B. A new bridge is being built over the river.

C. A new bridge is going to build over the river.                    D. A new bridge is built over the river.

48. I used to go to the cinema on Sundays.

A. I usually went to the cinema on Sundays.                          B. I got used to going the cinema on Sundays.

C. I didn’t go to the cinema on Sundays.                                 D. I usually go to the cinema on Sundays.

49. You feel unhealthy because you don’t take any exercise.

A. If you don’t take any exercise, you will feel unhealthy.     B. If you took more exercise, you would feel healthier.

C. If you take more exercise, you will feel healthier.              D. If you were healthier, you would take more exercise.

50. Unless we protect the environment, our life will be badly affected.

A. If we protect the environment, our life will be badly affected.

B. If we don’t protect the environment, our life will be badly affected.

C. If we don’t protect the environment, our life won’t be badly affected.

D. If our life is badly affected, we will protect the environment

II.Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions

8. If you get up early, you_________late.

      A. weren't                                    B. wouldn't be                       C. aren't                    D. won't be

9. It's very hot today. I wish I_________on the beach now.

      A. am                               B. was                        C. were                                    D. had been

10. She asked me if I________a laptop computer the following day.

       A.buy                              B. will buy                 C. bought                   D. would buy

11. We have learnt English________2001.         

      A. for                               B. since                      C. in                            D. during

12. Mr. Long said that he________in Ho Chi Minh City.

      A. lived                           B. is living                 C. has lived               D. will live

13. Your sister works in a foreign company, ________she?

      A.isn’t                              B. didn’t                    C.wasn’t                     D. doesn’t

14.   They_________Ho Chi Minh City last summer.

       A. visit                           B. will visit                C. have visit              D. visited

15.    _________Friday morning, there is a meeting between 11am and 1 pm.

       A. In                                B. For                         C. On                          D. At

16. My father asked us_________too much time playing computer games.

      A. not to spending                     B. did not spend       C. not to spend                       D. to not spent

17. If I were a flower, I_________a sunflower.

      A. was                              B. were                                    C. will be                 D. would be