1. Dmitri Mendeleev developed the concept of the periodic repetition of properties. 2. There are 8 columns in the periodic table. In each column, elements are arranged by the same properties, such as the same orbital arrangement of electrons. 3. Mendeleev predicted properties of yet undiscovered (missing) elements and left empty spaces for them in the table. 4. There are natural groupings between the elements that are closely related to each other. 5. In order to understand better these natural groupings, chemists have tried to fit the elements into a single plan. 6. John Ncwlands made one of the first attempts to fit the relationships among the elements by suggesting the Law of Octaves.
4 Look at sentences 1-5 and read the
rules. Then change the words in blue
using your own ideas.
1 You shouldn't smoke. It's dangerous.
2 You mustn't take drugs. It's illegal.
3 You don't have to diet. It isn't healthy.
4 You have to give your opinion.
5 The message should be clearer.
Объяснение:
4 Посмотрите предложения 1–5 и прочтите
правила. Затем измените слова синим
используя свои собственные идеи.
1 Не курите. Это опасно.
2 Нельзя принимать наркотики. Это незаконно.
3 Вам не нужно соблюдать диету. Это не здорово.
4 Вы должны высказать свое мнение.
5 Сообщение должно быть более четким.
2. There are 8 columns in the periodic table. In each column, elements are arranged by the same properties, such as the same orbital arrangement of electrons.
3. Mendeleev predicted properties of yet undiscovered (missing) elements and left empty spaces for them in the table.
4. There are natural groupings between the elements that are closely related to each other.
5. In order to understand better these natural groupings, chemists have tried to fit the elements into a single plan.
6. John Ncwlands made one of the first attempts to fit the relationships among the elements by suggesting the Law of Octaves.