user-avatar
ngockhanhno3
2 năm trước
Vỏ electron nguyên tử của 1 nguyên tố a có 53 electron .Hãy cho biết -nguyên tử có bao nhiêu lớp electron -lớp ngài cùng có bao nhiêu electron -A là kim loại hay phi kim xác định nguyên tố a
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Period 30: Preparing date :18/10/2020 Exercise 1: Put a word from the box in each gap to complete the following passage. has classroom comes windows in Minh's new school is (1)...... the city. It is big. His school has four (2).........and twenty-four (3).....There are nine hundred and sixty (4)....in his school. Every day, Minh (5)..........up at six thirty. He gets dressed, brushes his teeth and washes his face He (6)............ Breakfast at seven. He goes to (7).......... at seven fifteen. Today is on duty. He comes to school very early. He opens all the (8)....... He cleans the floor and the (9)......Everything is ready when the teacher (10)....into the room. Exercise 2: Complete the sentences with the verbs in the present continuous. 1.Look!They (swim)...... 2. Don't disturb her! She(read)..... 3. They (enjoy)... 4. He(play).... 5. You(do). 6. Look! The girls(play).... 7. They(study)..... 8. Listen! Someone (knock).. 9. Where is Tuan?- He (have).... 10. It's ten o'clock now. My sister (listen).... Exercise 3: Put the verb in the present simple tense. 1. Every morning I (get)........up at 5.30 2. Hoa (get) 3. I (brush).. 4. She (brush) 5. We (have).. 6. My mother (have)... 7. They (go).. EXERCISE school gets students floors blackboard ......in the river. ...a good book. .... her holiday at the moment. .computer games now. your homework? ....in the school yard. .in the library now? ..at the door. .lunch. .to music. .up at 5.45 .my teeth, (wash)..... ..her teeth, (wash)....... ..breakfast at 6 o'clock. ..breakfast at 6.30. my face. .her face. .to school 6.45

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team