General Science Chemistry Periodic Table

ಆಧುನಿಕ ಆವರ್ತಕ ಕೋಷ್ಟಕದಲ್ಲಿ ಎಷ್ಟು ಲಂಬ ಕಾಲಮ್‌ಗಳಿವೆ?

1

16

2

20

3

14

4

18

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