How to find groups and periods in periodic table

1.	How to find groups and periods in periodic table
Answer» Number of shells is equal to its period number. No. Of electrons in the last shell gives us group number when 10 is added to it See agar valence shell mein 1ya 2 electron hai toh uska group bhi 1 ya 2 hoga par for 3,4,5.....and so on hum usme +10 karte hai for example valence shell me 4 electron hai toh uska group 14 hoga(10+4) .....I HOPE IT Is Clear to you.......(Nobel gas ka group 18 hi hoga kyoki ye ek exceptional case hai)....

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