2

PTKOxi = 16 . 2 = 32 

PTK_h/c = 1,25 . 32 = 40

NTK_M = 40 - 16 = 24 

→ M là nguyên tố Magie

Đáp án: MgO

C

1. We _________to the countryside two months ago.
A. go B. have gone C. went D. will go
2. It rained hard. ........................, my father went to work.
A. Therefore B. However C. Because D. So
3. Your sister writes poems and stories,……… she?
A. does B. doesn‘t C. will D. won‘t
4. How much............................ do you want?
A. bananas B. eggs C. candies D. sugar
5. Do you know the man ____ you met at the party yesterday?
A. what B. which C. whom D. whose
6. Tomorrow the director will have a meeting .......................8:00 am to 10:00 am.
A. between B. from C. among D. in
7. The doctor advised me ____jogging every morning.
A. went B. go C. to go D. going
8. If I ________________a bird, I would be a dove.
A. would be B. were C. am D. will be
9. Minh is very hard-working boy. He doesn’t mind ______ a lot of homework in the evenings.
A. making B. reading C. seeing D. doing
10. “My favourite leisure activity is people-watching.” “_______”
A. That sounds so weird! B. That’s all right.
C. OK. That‘s what you’ve chosen. D. Sure. It’s very entertaining.

Adrien Hoan okey. thanks 

C nhá. mik vừa hc bài này xong