trick tofind group and period?
Answers
ANSWER:
The number of shells in the electronic configuration of the given element determine it's period i.e. if there are 3 shells in an atom then it will belong to period 3.
The number of valence electrons in the atom determines the group number of that atom i.e. if an element has 4 valence electrons then it must belong to group IV A.
Let us take an example:
Element: Sodium
Symbol: Na
Electronic Configuration: 2, 8, 1
Since sodium has 3 shells, it belongs to period 3. Also, we notice that this element has 1 electron in its outermost orbit therefore it belongs to group I A.
Hence, Sodium is present in group IA of period 3 in the modern periodic table.
Hope this helps you.....
Answer:
hello mate, here is your answer-1st- the period of element related the number of cell of an atom of the given element. 2nd-the group is similar to the no. of valence electrons of given element.