2. Read the names of the elements and identify their location in relation to other

elements.

* to be to the right (left) of ...

* to be near ...

* to be between ... and ...

* to be next to ...

C carbon	N nitrogen	O oxygen	F fluorine
Si silicon	P phosphorus	S sulfur	CI chlorine
Ті titanium	V vanadium	Cr chromium	Mn manganese

3. Select the appropriate word from the list provided.

Hydrogen (H) is the first element in the ___________because it has just _________in its nucleus. _______(He) is second, because it has two protons, and so on. The periodic table can be ___________ . Often, each group is given a ____________ so that it is easy to pick out all the elements that belong to a particular group. As well as a name, each element has a _________. Often this is the first letter or two of the element's name, but it can come from a ______________. Each also has an atomic number and a ____________.

• coloured-coded

• periodic table

• Latin name

• Helium

• mass number

• one proton

• particular colour

• symbol

4. You've discovered a new element. What name would you like to give to the new element? Describe its properties, molecular weight, its use in chemistry, pharmacy, and industry. Самостійна робота

Independent work

Periodic table of the lements

The periodic table of the chemical elements is a tabular method of displaying the

chemical elements. This invention is generally credited to Russian chemist Dmitry Mendeleyev in 1869. Mendeleyev intended the table to illustrate "periodic" trends in the properties of the elements.

In 1869, Mendeleyev classified 56 elements on the basis of their physical and chemical properties in the increasing order of the atomic masses, in the form of a table. Mendeleyev had observed that properties of the elements orderly recur in a cyclic fashion. He found that the elements with similar properties recur at regular intervals when the elements are arranged in the order of their increasing atomic masses. He concluded that "the physical and chemical properties of the elements are periodic functions of their atomic masses". This came to be known as the law of chemical periodicity and stated: "The properties of the elements are a periodic function of the nuclear charges of their atoms".

Based on this law all the known elements were arranged in the form of a table called the “Periodic Table”. D. I. Mendeleyev arranged all the elements in a table consisting of vertical groups and horizontal periods. In this table all the uncoordinated data on the properties of elements and their compounds arc collected and arranged into one well-constructed system. It enables scientists to predict the possibility of discovering new elements and their properties and to correct the errors made in previous definitions of the properties of known elements.

The layout of the table has been refined and extended over time, as new elements have been discovered, and new theoretical models have been developed to explain chemical behavior.

The periodic table is now used within the academic discipline of chemistry, providing an extremely useful framework to classify, systematize and compare all of the many different forms of chemical behavior. The table has also found wide application in physics, biology, engineering, and industry. The table contains 117 elements as of 27 January 2008 (elements 1—116 and element 118).

What new information have you learned from the text? Fill in the grid.

D.I. Mendeleyev	Mendeleyev discovered	Mendeleyev predicted	Mendeleyev experimented with
What I knew about the topic
What I have learned about the topic