MCQ
Theory of ionization was given by
- ARutherford
- BGraham
- CFaraday
- ✓Arrhenius
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In which of the following pair above statement is $NOT$ $CORRECT$ ?

| Period number | Group number | |
| $Q$ | $2$ | $15$ |
| $P$ | $3$ | $2$ |
Then formula of the compound formed by $P$ and $Q$ element is