Question
Identify the group and valency of the element having atomic number 119. Also predict the outermost electronic configuration and write the general formula of its oxide.
✓
Answer
The present long form of periodic table has seven periods and the last element of this period is the element with atomic number 118 . Thus, the element with atomic number 119 is the first member of $8^{\text {th }}$ period and a member of alkali group with outer electronic configuration, $8 s^1$. It belongs to first group and therefore, its valency is one. The formula of its oxide is $\mathrm{M}_2 \mathrm{O}$.
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