how many groups and how many periodis are these in modern periodic table?
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2
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There are currently seven complete periods in the periodic table, comprising the 118 known elements. Any new elements will be placed into an eighth period; see extended periodic table.
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Period 1.
Group118Atomic # Name1 H2 He
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Hope the answer is friend
Explanation:
There are currently seven complete periods in the periodic table, comprising the 118 known elements. Any new elements will be placed into an eighth period; see extended periodic table.
...
Period. 1.
Group 1 18
Atomic # Name1 H 2 He
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