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X có cấu hình Electron: \(1s^22s^22p^63s^23p^4\) \(\rightarrow\) X thuộc ô 16, chu kì 3, nhóm VIA
Y có: \(\left\{{}\begin{matrix}p+e+n=40\\p+e-n=12\end{matrix}\right.\) \(\Rightarrow\) \(\left\{{}\begin{matrix}p=e=13\\n=14\end{matrix}\right.\) có cấu hình Electron \(1s^22s^22p^63s^23p^1\) \(\Rightarrow\) Y thuộc ô số 13, chu kì 3, nhóm IIIA
\(Z^{2+}\) có: p = 29 \(\Rightarrow\) p của Z cũng bằng 29 (= e) nên p có cấu hình electron: \(1s^22s^22p^63s^23p^64s^13d^{10}\)
Suy ra Z thuộc ô 29, chu kì 4, nhóm IB.
Chọn câu A.
a, (1) for
(2) from
b,(3) of
c,(4) on
d, (5) for
(6) at
e, (7) to
f, (8) to
g, (9) because
(10) of
h, (11) than
(12) in
i, (13) with hoặc and
(14) by
j, (15) it
k, (16) on
(17) in
l, (18) to
m, (19) my
(20) of
em ko bt có đúng hay ko đâu ạ, em chỉ làm cho đỡ rảnh thui ạ qwq
Give the correct tense or form of the verbs in brackets.
a. The ladder looks unstable. It (1. fall) _will fall_ apart. I wish I (2. have) had enough time to do something
about it.
b. My teacher was not at home when I (3. arrive) _arrived___. She (4. just/ go) has just gone__ out.
c. By the time he (5. return) _returns_____ next year, his daughter (6. already/ leave) _has already left__ school.
d. I (7. never/ read) _have never read_____ any novels (8. write) _was written_____ by a Korean author.
e. She (9. walk) _walked_____ all the way home. That's why she (10. be) _is__ tired now.
f. I dis living in London because it (11. rain/ always) _(always rains/is always raining)___.
g. The plane had taken off before they (12. arrive) __arrived____ at the airport yesterday.
h. The children seemed (13. be) _/__ surprised to hear the news.
Câu h này hình như sai đề,câu này đủ rồi,cấu trúc seem phải thế này cơ mà
Subject + seem + adjective
i. A: Why are you holding a piece of paper?
B: I (14. write) _am writting___ a letter to my friends in Texas.
j. The Titanic (15. cross) __was crossing____ the Atlan when it (16. strike) struck______ an iceberg.
k. Ted: It is so hot in here!
Sarah: I (17. turn) will turn______ the air-conditioning on.
l. By the time he stopped at the first gas station, he (18. drive) _has driven_____ for three hours.
m. Wind (19. come) _comes_____ from differences in air pressure.
n. My brother is the only one (20. realize) ___realized___ the danger.
+ Mình làm chắc còn sai,có gì mọi người chỉ bảo...
potato potato bạn ơi, câu h đúng mà, có cấu trúc SEEM TO BE mà bạn
Happy 18th birthday! Hard to believe that you are actually 18, because it's so easy for me to remember when we were 12 and 13, taking selfies with our iPod's, and thinking it was the coolest thing ever to stay up all night. 18 has been hands down the most interesting year for me, in terms of lessons learned, and new experiences that I can check off my bucket list. If there was only one thing I could do for you on your 18th birthday, it would be to share with you some of my lessons. One of the first things I learned as I started my 18th year was to stay humble. This might seem like a weird first lesson to you but I thought it was important. You're one of the most intelligent and best people I know, but try not to let it get to your head. College is different than high school.
…An example of what I've seen before. Not my writing.
A