An atom of element with the configuration 1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\)3P\(^5\) is likely to belong to
The electron configuration provided is 1s² 2s² 2p⁶ 3s² 3p⁵.
The outermost energy level (principal quantum number n = 3, or the third shell) contains the valence electrons.
To find the number of valence electrons, the electrons in the 3s and 3p sub-shells are summed: 2 + 5 = 7 valence electrons. Elements with 7 valence electrons in their outermost shell belong to Group 7 (or Group 17 in modern IUPAC notation) of the periodic table, known as the halogens.
The element with this configuration is chlorine (atomic number 17).
The correct option is A - Group 7
There is an explanation video available below.
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