Среди всех элементов олово имеет наибольшее число природных изотопов 10. Самый тяжелый из них содержит столько же нейтронов. сколько изотоп иода-127. Определите состав ядра самого тяжелого изотопа олова: число протонов, число нейтронов и массовое число.

Число протонов:






ПОМОГИТЕ СРОЧНО!!(не то ,нам хана)​

III. Complete the sentences. Choose the correct variant.

Example: I’ve got a lot of … (work/ works) to do for the weekend. –

                I’ve got a lot of  work to do for the weekend.

1. The damage (was /were ) very serious.

2. There ( is/are) a lot of snow on the roofs.

3. Whose (was/ were) that money?

4. The Police (was/were) in time and the criminals were caught.

5. I don’t like the colour of your (hair/ hairs).

6. I never eat much (bread/ breads).

V. Complete the sentences. Choose the correct variant.

Example:  My mother disapproved of … (to read/ reading) thrillers. -

                 My mother disapproved of  reading thrillers.

1. I don’t know the way of (to pass/ passing) the exams successfully.

2. We usually enjoy (to ride/ riding) a bicycle.

3. My  neighbour asked me to stop (to skateboard/ skateboarding) in front of his house.

4. Do you believe we’ll manage (to get/ getting) there on time.

5. I quitted (to jog/ jogging) in the morning.

6. My friends offered me (to spend/ spending) the weekend in the countryside.