41. How many valence electrons are in an atom with configuration 1s2 2s2 2p6 3s2 3p2?1 point65432
Question
41. How many valence electrons are in an atom with configuration 1s² 2s² 2p⁶ 3s² 3p²?
1 point
6
5
4
3
2
Solution
The electron configuration 1s2 2s2 2p6 3s2 3p2 represents the distribution of electrons in an atom's energy levels.
Valence electrons are the electrons in the outermost energy level of an atom. In this case, the outermost energy level is the third level (3s2 3p2).
So, to find the number of valence electrons, you just need to add up the electrons in the 3s and 3p orbitals.
3s2 means there are 2 electrons in the 3s orbital. 3p2 means there are 2 electrons in the 3p orbital.
So, 2 (from 3s2) + 2 (from 3p2) = 4.
Therefore, an atom with the electron configuration 1s2 2s2 2p6 3s2 3p2 has 4 valence electrons.
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