Is it too late to answer now :))??!

But I still want to share you a book that written by Khanh Vy and Thien Khiem. This book is " English isn't difficult, so don't frown" (Tiếng Anh không khó, đừng nhăn nhó). Khanh Vy is a famous youtuber and she is good at English. Therefore, through this book, she shares her methods for us to study English in a right way :)!

I think each of us should read it to have a method to improve English's skills by ourselves. I have read it for 2 months, I read it many times and thanks to that, i have improved my English so much :)

If you don't like studying English, I advise you to read it, it will give you energy, stimulation to learn English. In this occasion - Tet holiday, why don't we try to improve English by reading and following it :))??!  And having a target like " In 2021, I will learn 1000 vocabulary, have band 7 in IELTS online tests" and so on...

I hope you have a good health, study well in 2021! Try your best :)

Di cư rồi hả a :)))

Tuần sau thu thêm nhẹ bản nữa để tặng :))

Nghe phát ghê :))

Chờ Hùng hen =))

Còn kịp không nhỉ =)?

\(CHe:1s^22s^22p^5\)

\(+STT:9\)

\(+CK:2\)

\(+\) Nhóm: \(VII\)

\(+\) Phân nhóm: A

Gọi tên: F - Flo 

Tính chất hóa học cơ bản: Tính phi kim

\(CTTQ:M_2O\)

Theo đề bài ta có:

\(\dfrac{16}{2M_M+16}.100=25,8\Leftrightarrow M_M=23\)

\(\rightarrow M:Na\left(Natri\right)\)

\(\rightarrow CTPT:Na_2O\)

( Công thức phân tử chứ không phải công thức phương trình nhé!)