PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoFill in the blanks:
| atomic numbers | periods | seven | groups |
| first period | \(118\) | seven and eighteen | rows and columns |
| eighteen | two | hydrogen and helium | One and two |
| atomic masses | second period | three | hydrogen and oxygen |
1. The modern periodic table based on the elements were arranged in the increasing order of their __________.
2. The modern periodic table of __________ elements discovered so far.
3. The modern periodic table has __________ groups.
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