X 3 +  có cấu hình electron là: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 5 . Vị trí của nguyên tố X trong bảng tuần hoàn là

A. ô số 26, chu kì 4 nhóm VIIIA.

B. ô số 26, chu kì 4, nhóm IIA.

C. ô số 26, chu kì 3, nhóm VIIIB.

D. ô số 26, chu kì 4, nhóm VIIIB.

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

My brother was worried about being interviewed on television, but he _____________ to the occasion wonderfully.

A. raised

B. rose

C. fell

D. faced

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

She turned the radio on at 7.30. She was still listening to it when her mother came home at 9.00.

A. She has been listening to the radio at 7.30

B. She had been listening to the radio since 7.30

C. She has been listening to the radio after 7.30

D. She had been listening to the radio by 7.30

I turned up a TV because I wanted to hear the music clearly.