Devision of electrons in energy levels
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p
1. Write down electronic configuration and orbital shells positions of elements
with atomic number 15, 26, 34, 38, 54, 73, 82, 87
2. Find the atomic number and title of metals with following electron
configuration.
1) ...3p
6
4s
2
2) ...2p
6
3s
2
3) ...4p
6
5s
2
4)1s
2
2s
2
5) ...5p
6
6s
2
6)...5d
10
6p
4
3. Find levels of chromium occupied with electrons ? Answer:2,5
4. Write electron configuration of oxygen in the molecule of H
2
O ? Answer
:..2p
5
5. Find the degree of oxidity of chlorium in ammonium dichromate molecule
and write its electron configuration? Answer : +6, ...3s
2
3p
6
6. In the order of occupation of levels with electrons which orbital will get
electron before 3d. Answer: 4s
262
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