Why are 8 elements in 3rd period
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The Period Three of the periodic table consists of the elements whose atoms has three shells occupied by electrons in its Ground State (when it is not excited or in a reaction). According to the Aufbau's Principle there are only EIGHT elements that satisfy this. This is because the S orbital of the fourth shell sits at a lower energy level (closer to the nucleus) than the d orbital of the third shell. Therefore when the s and p orbitals of the third shell has been filled the next element (K) has its outer most electron in the S orbital of the fourth shell. Hence it is in period 4.
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The Period Three of the periodic table consists of the elements whose atoms has three shells occupied by electrons in its Ground State (when it is not excited or in a reaction). According to the Aufbau's Principle there are only EIGHT elements that satisfy this. This is because the S orbital of the fourth shell sits at a lower energy level (closer to the nucleus) than the d orbital of the third shell. Therefore when the s and p orbitals of the third shell has been filled the next element (K) has its outer most electron in the S orbital of the fourth shell. Hence it is in period 4.
hope it helps u❤️❤️
samadhannikam02:
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According to the Aufbau's Principle (the building up principle) there can be only EIGHT elements that satisfy this. This is because the S orbital of the fourth shell sits at a lower energy level (closer to the nucleus) than the d orbital of the third shell.
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