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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 Scherbak
4.762 reviews
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12
Jumanji
  • English

Jumanji

In this class we will become Jumanji players and move to the game that we will need to finish!

  • Theory with exercises
  • Pre-Intermediate
  • English
Maria  Nekrasova
Maria Nekrasova
58 reviews
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12
Hobby vs Career
  • English

Hobby vs Career

In this lesson we will talk about hobbies and if it can become a business

  • Theory with exercises
  • Advanced
  • English
Maria  Nekrasova
Maria Nekrasova
58 reviews
0
12
Sostiene Pereira
  • French

Sostiene Pereira

If you have not passed any test for 10 points, return to the appropriate sections of the grammar and analyze the incorrect answers using theoretical material.

  • Reading lessons
  • Advanced
  • English
Eugeniia Klimutina
Eugeniia Klimutina
4.945 reviews
0
12
Telling the Time: What time is it?
  • English

Telling the Time: What time is it?

This lesson helps learners understand how to ask for and tell the time in English. Students will learn key expressions such as o’clock, half past, quarter past/to, and how to use a.m. and p.m. They will also practice common questions and answers: “What time is it? – It’s …” and “When does it start? – At …”.

  • Image
  • Elementary
  • English
Oleg Ivanov
Oleg Ivanov
515 reviews
0
12
Possessive
  • English

Possessive

In this class we will learn family members and Possessive.

  • Theory with exercises
  • Beginner
  • English
Maria  Nekrasova
Maria Nekrasova
58 reviews
0
12
Parental control
  • English

Parental control

In this class we will discuss what is parental control and all the advantages and disadvantages of it. Also we will have a look on grammar topic - Used to and would.

  • Theory with exercises
  • Intermediate
  • English
Maria  Nekrasova
Maria Nekrasova
58 reviews
0
12
Presenting yourself
  • English

Presenting yourself

In this class we will practice presenting yourself and linking words.

  • Theory with exercises
  • Upper Intermediate
  • English
Maria  Nekrasova
Maria Nekrasova
58 reviews
0
12
Numbers, To be
  • English

Numbers, To be

In this class we will revise alphabet, learn numbers and To be, days of week

  • Theory with exercises
  • Beginner
  • English
Maria  Nekrasova
Maria Nekrasova
58 reviews
0
12
Having a child
  • English

Having a child

In this class we will discuss having a child and learn Zero and First Conditional

  • Theory with exercises
  • Pre-Intermediate
  • English
Maria  Nekrasova
Maria Nekrasova
58 reviews