CBSE Class 10 Answered
how do we determine the group and period to which the element belongs if their atomic number is given?
Asked by Apoorva Sakshi | 15 Feb, 2014, 05:51: PM
Expert Answer
- First take the Atomic number of the given element. Say Cl... Atomic no. 17
- Then calculate the electronic configuration using the atomic number 2+8+7=17 therefore the electronic configuration will be 2, 8, 7.
- Here we find that the no of valence electrons of element is 7 as the valence shell has 7 electrons.
- So know we easily understand that the group is 7 because the no of valence electrons is 7.
- Now to find the period we have to understand that the period is the number of shell the element is having therefore here chlorine has 3 shells (K-2, L-8, and M-7). So the period of the given element is 3.
Thus the position of the given element (here chlorine) is …..
Group |
VII A (17th ) |
Valence electrons = 7 |
Period |
3rd |
Number of shells = 3 |
Answered by | 17 Feb, 2014, 11:00: AM
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