explain why the number of elements in third period is 8
Answers
Answered by
100
The number of electrons present in the outermost shell of an atom is given by the formula 2n2, where n stands for the number of the given shell from the nucleus of an atom. All the elements present in the 3rdperiod have 3 shells. Therefore , n = 3 ,
2n2 = 2 x (3)2 = 2 x 3 x 3 = 2 x 9 = 18
Since the outermost or valence shell can accomodate only 8 electrons . Therefore , the 3rd period contains only 8 electrons .
2n2 = 2 x (3)2 = 2 x 3 x 3 = 2 x 9 = 18
Since the outermost or valence shell can accomodate only 8 electrons . Therefore , the 3rd period contains only 8 electrons .
Answered by
19
Answer:
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.
Similar questions