Читай. Most essential to our body is food. Be moderate in eating. “A man is what he eats”. Some foods are better than others in making strong muscles. Among them are meat, eggs and fish. Some foods are better in helping keep bones, teeth, skin and blood. Among these foods are fruit, vegetables, milk and cheese. If you eat slowly you will never overeat. Never swallow your food. Different foods do different things for our body. Never drink alcohol: first of all it cost a lot of money, which might be used for better purposes. Second, the person who drinks will become unfit for his duties. Both health and character are often ruined.
Many young people feel guilty about eating too much chocolate. Chocolate does contain a lot of fat. However, if your diet is balanced, eating chocolate in moderation is fine. Food is a form of fuel. It gives us energy, helps us to grow, resist disease and form strong teeth and bones. Different foods do different things for the body. Almost all food can be eaten without any cooking at all. Most people ear raw fruit and vegetables. Fresh fruit and vegetables are important for our health. The proverb says: “An apple a day keeps the doctor away”.
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.
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