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Answer the following questions:
Answer variants:
\({_2}n^2\), where n is the shell number
\(7\) horizontal rows are called groups
It is because they have one valence electron
P and R have the different properties because they have the same valance electrons
1. Why are H, Li, Na and K placed in group-1?
2. Write the formula which is used to determine the maximum number of electrons that a shell can accommodate.
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