What is the electron configuration of krypton? a. 1s22s22p62d103s23p63d8 b. 1s22s22p63s23p6 c. 1s22s22p63s23p64s24p64d10 d. 1s22s22p63s23p64s23d104p6 e. 1s22s22p62d103s23p64s24p64d10
What is the electron configuration of krypton?
a. 1s22s22p62d103s23p63d8
b. 1s22s22p63s23p6
c. 1s22s22p63s23p64s24p64d10
d. 1s22s22p63s23p64s23d104p6
e. 1s22s22p62d103s23p64s24p64d10
The correct answer and explanation is :
The correct electron configuration of krypton (Kr) is:
d. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶
Explanation:
Krypton (Kr) has an atomic number of 36, which means it has 36 electrons in its neutral state. The electron configuration is determined by filling orbitals in order of increasing energy levels. According to the Aufbau principle, electrons fill lower-energy orbitals first before moving to higher-energy orbitals.
- 1s²: The first two electrons go into the 1s orbital, which is the lowest energy orbital.
- 2s² 2p⁶: The next two electrons fill the 2s orbital, followed by six electrons filling the 2p orbital. This completes the second energy level with 8 electrons (2s² 2p⁶).
- 3s² 3p⁶: The third energy level is filled next. Two electrons go into the 3s orbital, and six electrons go into the 3p orbital, completing the third energy level with 8 electrons.
- 4s² 3d¹⁰ 4p⁶: After the 3p orbital, electrons fill the 4s orbital first, followed by the 3d orbital and then the 4p orbital. The 4s orbital is filled before 3d due to its slightly lower energy level. Krypton’s electron configuration is thus completed with 2 electrons in 4s, 10 electrons in 3d, and 6 electrons in 4p.
Thus, the full electron configuration of krypton is:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶
This configuration represents a stable, full electron shell structure, which explains why krypton is a noble gas. It has a complete outer electron shell and is chemically inert, which is a hallmark of noble gases.
Here is a diagram showing the electron configuration of krypton, with electrons filling the orbitals according to their respective energy levels and sublevels. The distribution of electrons in each orbital is labeled to help visualize the configuration.