Nguyên tử X nặng gấp 2 lần nguyên tử lưu huỳnh. Cho biết X thuộc nguyên tố nào và viết kí hiệu hoá học

Các câu hỏi liên quan

41. Gillian and Darren greeted the speakers with great__________. A. enthusiasm B. enthusiast C. enthusiastic D. enthusiastically 42. Dennis was a genuine _______ for financial matters. A. enthusiasm B. enthusiast C. enthusiastic D. enthusiastically 43. I explained our problems to the bank manager, and he is ______________ A. sympathize B. sympathy C. sympathetic D. sympathetically 44. The Irish are very __________ about horse racing. A. enthusiasm B. enthusiast C. enthusiastic D. enthusiastically 45. You should remember_______ the package for me. A. post B. posting C. to post D. to be posted 46. He could not hide his ______________ at his children’s rudeness. A. embarrassment B. embarrassing C. embarrassed D. embarrassingly 47. ‘The new program is really well designed,’ she says ____________. A. enthusiasm B. enthusiast C. enthusiastic D. enthusiastically 48. The nurse denied_______ the injection. A. having given B. giving C. to be given D. to give 49. She asked a lot of ______________ questions. A. embarrassment B. embarrassing C. embarrassed D. embarrassingly 50. I have always regretted __________harder at school. A.not studying B. not to study C. not to be studied D. not being studied 51. I hope I didn't ______________ you in front of your friends. A. embarrassment B. embarrassing C. embarrass D. embarrassingly 52. British Airways regret ______the cancellation of flight BA205 to Madrid. A. to announce B. to be announced C. announcing D. announce 53. If you want to get a good result in every work, you should have a ______ A. loyalty B. sympathy C. constancy D. unselfishness 54. A ______ friendship is a precious relationship. A. mutual B. sincere C. generous D. successful