MCQ
The outer electronic configuration of radioactive element present in IA group is:
- A8s1
- B7s1
- C5s1
- D6s1
✓
Answer
- 7s1
Explanation:
The radioactive element in group 1A is francium (Fr) atomic number 87 having electronic configuration (Rn) 7s1.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Bohr's model can explain
The bond order is maximum in
Which one of the following compounds is most reactive for $ArS_{N^2}$ reaction ?
→Which of the following property of an element never changes?
In the extraction of aluminium, bauxite is dissolved in cryolite because
The $IUPAC$ name of
→$\begin{array}{*{20}{c}}
{{{\left( {{C_2}{H_5}} \right)}_2}NC{H_2}CH \cdot COOH} \\
{\,\,\,\,\,\,\,|} \\
{\,\,\,\,\,\,\,Cl}
\end{array}$
is :
(no ring substitution) Product $(A)$ is
→The $pK_b$ of $C{N^\Theta }$ is $4.7.$ The $pH$ of solution prepared by mixing $2.5\,mol$ of $KCN$ and $2.5\,mol$ of $HCN$ in water and making the total volume upto $500\,mL$ is.
→Assertion : Absorption spectrum consists of some bright lines separated by dark spaces.
Reason : Emission spectrum consists of dark lines.
Reason : Emission spectrum consists of dark lines.
The $IUPAC$ name of following compound is
→