Tổng số hạt cơ bản trong nguyên tử của nguyên tố X là 40. Số proton trong nguyên tử X là
A.16.
B.19.
C.12
D.13.

Tổng số hạt p, e, n trong nguyên tử nguyên tố X là 10. Số khối của hạt nhân nguyên tử X là
A.3.
B.6.
C.2
D.7.

Một nguyên tử của nguyên tố X có tổng số hạt cơ bản là 34. Số proton trong nguyên tử X là
A.16.
B.11.
C.12
D.19.

Tổng số hạt cơ bản trong nguyên tử của nguyên tố X là 40. Số khối của hạt nhân nguyên tử
X là
A.22
B.27.
C.26.
D.23.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
John’s classmates usually make __________ of him because of his poor grades.
A.happiness
B.enjoyment
C.fun
D.entertainment

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
I couldn't sleep because the bed was so __________.
A.uncomfortable
B.inconvenient
C.comfortable
D.convenient

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
One of my friends had to drop out of school because her parents can’t __________ her.
A.provide
B.afford
C.supply
D.support

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Only two students from each class were __________ to join the competition.
A.selecting
B.opting
C.opted
D.selected

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
My father thinks it is not good for pupils to get __________ in a romantic relationship early.
A.permitted
B.allowed
C.involved
D.helped

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Everyone has __________ that make them attractive to other people.
A.characters
B.selling points
C.qualities
D.views