Question

If an element has an atomic number of $11$, it will combine most readily with an element that has an electron configuration of :

• A. $1s^{2}2s^{2}2p^{6}3s^{2}3p^1$
• B. $1s^{2}2s^{2}2p^{6}3s^{2}3p^2$
• C. $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$
• D. $1s^{2}2s^{2}2p^{6}3s^{2}3p^4$
• E. $1s^{2}2s^{2}2p^{6}3s^{2}3p^5$

Answer 1

The correct option is E $1s^{2}2s^{2}2p^{6}3s^{2}3p^5$

If an element has an atomic number of 11, it will combine most readily with an element that has an electron configuration of $1s^{2}2s^{2}2p^{6}3s^{2}3p^5$.
An element has an atomic number of 11 is sodium. It is highly electropositive alkali metal.
An element that has an electron configuration of $1s^{2}2s^{2}2p^{6}3s^{2}3p^5$ is chlorine.
It is highly electronegative halogen.
Highly electropostive alkali metal will combine with highly electronegative chlorine atom to form ionic compound NaCl.