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44
Periodic table of the elements
  • Chemistry

Periodic table of the elements

Periodic table, in full periodic table of the elements, in chemistry, the organized array of all the chemical elements in order of increasing atomic number—i.e., the total number of protons in the atomic nucleus. When the chemical elements are thus arranged, there is a recurring pattern called the “periodic law” in their properties, in which elements in the same column (group) have similar properties. The initial discovery, which was made by Dmitry I. Mendeleyev in the mid-19th century, has been of inestimable value in the development of chemistry.

  • Image
  • All levels
  • English
Andrei Scherbak
Andrei S.
0
44
The Russian Prepositional Case, and Going Places
  • Russian

The Russian Prepositional Case, and Going Places

In this lesson we will introduce the prepositional case. It will also attempt to expand your vocabulary to include a number of places. The prepositional case is one of the easiest Russian cases to learn. It is also one of the most useful. It will allow you to expand your use of Russian phrases to include useful phrases like “I live in Russia”. The prepositional case has no meaning of it’s own. It is simply used after certain Russian prepositions. Afterwards we will introduce you to the Russian words for ‘to go’. The prepositional case is used after the prepositions “в” (in), “на” (on/at), “о” (about).

  • Theory
  • Elementary
  • Russian
Eugeniia Klimutina
Eugeniia K.
0
44
Wea re different
  • English

Wea re different

----Wea re differentWea re differentWea re differentWea re differentWea re differentWea re differentWea re differentWea re differentWea re different

  • Theory with exercises
  • Intermediate
  • English
Darina Gribanova
Darina G.
0
44
Predictions
  • English

Predictions

Can people tell the future? Do you know of any predictions that became a reality? Why do people want to know what will happen? You will read an article about the predictions that worked and didn't work. Want to know why people even want to know their future? Then listen to a podcast where people share their thoughts about this. Then, of course, you will share your opinion using new vocabulary!

  • Theory with exercises
  • Intermediate
  • English
Darina Gribanova
Darina G.
0
44
Medicine
  • English

Medicine

In this class we will dicuss different illnesses and medicines, also we will learn the modal verb should.

  • Theory with exercises
  • Elementary
  • English
Maria  Nekrasova
Maria .
0
43
The Ice Hotel
  • English

The Ice Hotel

What Makes a Sentence? Grammar A sentence begins with a capital letter and ends with a terminal punctuation such as a period, a question mark, or an exclamation point. A single sentence consists of a single clause (a subject and a predicate). Other complex sentences consist of two or more clauses. (Is / Are) you into skiing? Of course, all of these parts of the hotel (is / are) made of ice.

  • Theory with exercises
  • Pre-Intermediate
  • English
Eugeniia Klimutina
Eugeniia K.