Chemistry
Grade-7
Easy
Question
Which of the following electronic configuration represents chlorine?
- 2,8,7
- All the above
Hint:
Electronic configuration can be written in a lot of ways. The atomic number of chlorine is 17.
The correct answer is: All the above
- Chlorine is a chemical element with the chemical symbol Cl and atomic number 17. There are a lot of ways to write the electronic configuration of chlorine.
- If we write the electron configuration of chlorine, the first two electrons go into the 1s orbital. Since 1s can only hold two electrons, the next two electrons of chlorine move to the 2s orbitals. The next 6 electrons enter the 2p orbitals. A p-orbital can hold up to 6 electrons. Put 6 electrons in the 2p orbitals, and the next two electrons in the 3's orbitals. Now that 3s is full, let's move on to 3p where we place the remaining 5 electrons. Therefore, the electron configuration of chlorine is 1s2 2s2 2p6 3s2 3p5.
- 2,8,7. Here 2 electrons are in the other shell, then 8 in the next, and 7 in the last octet shell.
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