An element in the periodic table has the electronic configuration of 2, 8, 7. Which of the following family does the element belong to?
An element in the periodic table has the electronic configuration of 2, 8, 7. Which of the following family does the element belong to?
The correct option is D Halogens
From the electronic configuration, it is clear that the last shell has 7 electrons. The rule to find the group number from the number of electrons in the last shell is as follows:
1) If the number of last shell electrons is 1 or 2 then the group number is also 1 and 2 respectively.
2) If the number of last shell electrons is more than 2, then the group number = Number of electrons in last shell + 10
Since the element given to us has 7 electrons in the last shell. So the group number for this element is
Group number = 7 + 10
Group number = 17
So the group number of this element is 17 which is the halogen family in the periodic table.
From the electronic configuration, it is clear that the last shell has 7 electrons. The rule to find the group number from the number of electrons in the last shell is as follows:
1) If the number of last shell electrons is 1 or 2 then the group number is also 1 and 2 respectively.
2) If the number of last shell electrons is more than 2, then the group number = Number of electrons in last shell + 10
Since the element given to us has 7 electrons in the last shell. So the group number for this element is
Group number = 7 + 10
Group number = 17
So the group number of this element is 17 which is the halogen family in the periodic table.
