MCQ
The maximum valency of an element with atomic number $7$ is
- A$2$
- ✓$5$
- C$4$
- D$3$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Give the structural formula of compound $(B)$
$(i)$ $1s^22s^2p^63s^1$ $(ii)$ $1s^22s^22p^64s^1$
Which of the following statements is/are false ?
$(a)$ Energy is required to change $(i)$ to $(ii)$
$(b)$ $(i)$ represents $‘Na’$ atom
$(c)$ $(i)$ and $(ii)$ represent different elements
$(d)$ More energy is required to remove one electron from $(i)$ than $(ii)$