JEE Main 201912 AprilMorning Shift
- Exam
- JEE Main
- Year
- 2019
- Date
- 12 April
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- Classification of Elements and Periodicity in Properties
JEE Main 2019 · 12 April · Morning Shift · Chemistry · Classification of Elements and Periodicity in Properties
The group number, number of valence electrons, and valency of an...
The group number, number of valence electrons, and valency of an element with atomic number respectively, are:
Options
- A and
- B and
- C and
- D and
Correct answer
D. and
Step-by-step solution
Atomic number electronic configuration is
\left(15\right) \to 1{s}^{2}, 2{s}^{2}, 2{p}^{6}, 3{s}^{2}, 3{p}^{3}= 15{e}^{-} ⇒ {e}^{-}= 2 + 3 = 5= 33 electron to complete its octet.
\left(15\right) \to 1{s}^{2}, 2{s}^{2}, 2{p}^{6}, 3{s}^{2}, 3{p}^{3}= 15{e}^{-} ⇒ {e}^{-}= 2 + 3 = 5= 33 electron to complete its octet.