Question

An element has electronic configuration $1s^2,2s^2,2p^6,3s^2,3p^3$ Predict their period, group and block

• A. Period = $3^{rd}$, block = $p$, group = $15$
• B. Period = $5^{th}$, block = $s$, group = $1$
• C. Period = $3^{rd}$, block = $p$, group = $10$
• D. Period = $4^{th}$, block = $d$, group = $12$

Answer 1

Answer: (A)

By observing principal quantum number (n), Orbital $(s,p,d,f)$ and equating no. of $e^{-}$’s we are able to find the period, block and group of element in periodic table