MCQ
The nucleus of an element contain $ 9 $ protons. Its valency would be
- ✓$1$
- B$3$
- C$2$
- D$5$
✓
Answer
Correct option: A.
$1$
a
(a) Since its nucleus contain $9$ proton so its. atomic number is $ 9$ and its electronic configuration is $ 2, 7. $ So it require one more electron to complete its octet. Hence its valency is $1.$
(a) Since its nucleus contain $9$ proton so its. atomic number is $ 9$ and its electronic configuration is $ 2, 7. $ So it require one more electron to complete its octet. Hence its valency is $1.$
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
$\mathrm{A}_{3} \mathrm{~B}_{2}$ is a sparingly soluble salt of molar mass $\mathrm{M}\left(\mathrm{g} \,\mathrm{mol}^{-1}\right)$ and solubility $\mathrm{x}\, \mathrm{g}\, \mathrm{L}^{-1}$. The solubility product satisfies $\mathrm{K}_{\mathrm{sp}}=a\left(\frac{\mathrm{x}}{\mathrm{M}}\right)^{5}$. The value of $a$ is ...... . (Integer answer)
→Hydrogen is a non$-$metal having $.........$ electron in the valence shell:
→The element with atomic number $117$ has not been discovered yet. In which family would you place this element if discovered?
→Glycerol can be separated from spent$-$lye in soap industry by:
→The total value of magnetic quantum number for $n = 4$
→The formation of energy bonds in solids are in accordance with
Use the following data to answer the question below.
→Calculate the resonance energy of anthracene.......$kcal/mol$
Identify most acidic hydrogen in given compound.
Find out the value of $K_C$ for the following reaction from the value of $K_P$
→$2NOCl(g)\, \rightleftharpoons \,2NO(g)\, + \,C{l_2}(g)$
[Given : $K_P = 8 \times10^{12}\,atm$ at $500\,K$ use $R = 0.08\,L\,atm\,mol^{-1}\,K^{-1}$ ]
When disorder of a system increases, the change is said to be