1.Which of the following represents the ground electronic configuration of an isolated halogen atom? 1s2 2s2 2p6 3s2 3p5 1s2 2s2 2p4 1s2 2s2 2p6 1s2 2s2 2p6 3s2 3p6 4s2 3d5 1s2 2s1
Question
1.Which of the following represents the ground electronic configuration of an isolated halogen atom? 1s2 2s2 2p6 3s2 3p5 1s2 2s2 2p4 1s2 2s2 2p6 1s2 2s2 2p6 3s2 3p6 4s2 3d5 1s2 2s1
Solution
The ground electronic configuration of an isolated halogen atom is 1s2 2s2 2p6 3s2 3p5. This is because halogens are in the 17th group of the periodic table, which means they have 7 electrons in their outermost shell (the p shell). The 3p5 indicates that there are 5 electrons in the 3rd shell's p orbital, which, when combined with the 2 electrons in the 3rd shell's s orbital (3s2), gives a total of 7 electrons in the outermost shell.
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