Một ngtử của ngtố X có tổng 3 loại hạt p,n,e là 115 hạt. Biết số hạt mang điện chiếm 60,87%. a/ Tính số p,n,e ,số khối A. b) Tìm tên ngtố, viết kí hiệu ngtử.

Mn giúp giùm từ câu 7 đến câu 13 ạ tks nhiều

Exercise 2: Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions. Question 1: Living expenses in this country, as well as in many others, are at an A B C all-time high. D Question 2: The effects of cigarette smoking has been proven to be extremely harmful. A B C D Question 3: It is impossible to believe that somebody actually admire that man. A B C D Question 4: Every Elementary School teacher have to take a training course. A B C D Question 5: John, along with twenty friends, are celebrating a party. A B C D Question 6: Linguistics bring us to further understanding of cultures, societies A B C D and civilizations. Question 7: English is one of the most popular language in the world. A B C D Question 8: It is disconcerting to believe that every possible candidate have been A B C rejected for one reason or another. D Question 9: We believe that some of the employees is going to be promoted to the A B C D higher position. Question 10: The decision regarding the merger of the two companies were announced A B C to the public yesterday. D Question 11: The interrogation, conducted by the police officers, have lasted for A B C D several hours. Question 12: Success in business requiring certain strategies that satisfy both the A B C employer and the employees D Question 13: Either Pete or John are helping today with stage decorations. A B C D Question 14: The state of Michigan have endowed three institutes to do research for A B C D industry. Question 15: Everyone on the board of directors agree with the planned merger. A B C D Question 16: The manager and accountant have been on business for a week. A B C D Question 17: The number of corrections made during the first stage have influenced the A B C charges significantly. D Question 18: All of the students in the class taught by Professor Roberts is required to A B C turn in their term papers next Monday. D Question 19: None of the boys in this class are good at English. A B C D Question 20: Not only the painting method but also the colors has aroused the interest A B C of art critics. D Question 21: The singer and composer are performing tonight. A B C D Question 22: Every staff member require to be trained in security procedures to ensure A B the safety of customer's private information C D Question 23: The students hasn’t done their homework yet. A B C D Question 24: The furniture were more expensive than we had thought. A B C D Question 25: Studying a foreign language often lead students to learn about the A B culture of the countries where it is spoken. C D Question 26: Everybody who have a fever must go home at once. A B C D Question 27: The president felt that no one were better suited for the position of chief A B C D staff advisor. Question 28: Our website has a page that answer frequently asked questions by its u Giải hộ mình với ạ

nhanh hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

giúp mình với ạaaaaaaaaaa.gấp lắm

Giúp e vs e đang cần gấp e cảm ơn

Giúp hộ mình với ạ đang cần gấp

cho hai số a và b viết chương trình tính tích 2 số đó

Vì sao trong cuộc đấu tranh chống tư sản, công nhân lại đập phá máy móc? Nếu là em, em sẽ làm gì?

Câu 2: Cho Al, nguyên tử X thuộc cùng 1 chu kì với Al và đứng cách Al 4 nguyên tố. a) Xác định số hạt p, n, e và điện tích hạt nhân của nguyên tử Al. b) Xác định số hiệu nguyên tử và viết cấu hình electron của nguyên tử X. c) Hãy cho biết X là kim loại, phi kim hay khí hiếm? Vì sao?