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3. Make up another sentence with the same meaning using passive structures. 1) They also use this term in the different advancements of computer technology. .2) People are constantly developing new discoveries that affect the way we live, work and play. 3) Thomas Edison invented the light bulb the same time as Lee De Forest invented vacuum tubes that worked very similar to light bulbs. 4) People made transistors of solid material, some of which is silicon, an abundant element (second only to oxygen) found in beach sand and glass. 5) People found transistors to conduct electricity faster and better than vacuum tubes. 6) However, no one could predict that thousands even now millions of transistors (circuits) people could compact in such a small space. 7) Computers could reach more calculation and faster speeds by putting mil-lions of transistors onto one single chip. 8) Ted Hoff, employed by Intel (Robert Noyce's new company) invented a chip the size of a pencil eraser that could do all the computing and logic work of a computer.
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.