1.

1. Write the electronic configuration of elements with atomic number 1-102. List the elements in group 183. Now try to write their electronic configuration4. How many electrons are there in the outermost shell of each element?5. The elements do not normally take part in chemical reactions. Find the reason?6. Which group of elements belong to transition elements?7. Find out whether elements familiar to you are present in these groups?8. Aren’t transition elements metals?

Answer»

1.

 Element Atomic number  Electronic configuration
Hydrogen 1 1
Helium 2 2 
Lithium 3 2,1
Beryllium 4 2,2
Boron 5 2,3
Carbon 6 2,4
Nitrogen 7 2,5
oxygen 8 2,6
Fluorine 9 2,7
Neon 10  2,8

The atom of the elements of these group show the periodically in electron filling they contain 1 -8 electron in their outermost shell. The elements of these groups are called representative elements.

2. Helium, Neon, Argon, Krypton, Xenon, Radon

3. 2He – 2 

10Ne – 2, 8 

18Ar – 2, 8, 8 

36Kr – 2, 8, 18, 8 

54Xe – 2, 8, 18, 18, 8 

86Rn – 2, 8, 18, 32, 18, 8

4. 8

5. They have a stable configuration in the outermost shell.

6. Elements of group 3-12 in the periodic table are transition elements

7. Copper, silver, gold, iron

8. Yes


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