Question

complete the following table diagram of electronic of configuration atom name of element electronic configuration is 2,8,2 number of Valence electrons​

Answer 1

Answer:

element name is magnesium

valency - 2

Answer 2

An atom of element electronic configuration (2,8,2) is Magnesium

As It belongs to the third period and second group. (As the electrons are divided into 3 various shells, thus period is 3)

The valency of Magnesium(Mg) is 2

Now,

The Electronic configuration of magnesium is

$1s^{2}2s^{2}2p^{6}3s^{2}$

Or shortly,

$[Ne]3s^{2}$

Here is the table

$\begin{array}{| c | c | c | c |}\cline{1-4} \sf Atomic\:No.&\sf Elements& \sf Valency&\sf Electronic\ configuration \\ \cline{1-4} 1 & Hydrogen \bf{(H)} & 1 & 1s^{1} \\ \cline{1-4} 2 & Helium \bf{(He)}& 0 & 1s^{2} \\ \cline{1-4} 3 & Lithium \bf{(Li)} & 1 & [He]2s^{1}\\ \cline{1-4} 4 & Beryllium \bf{(Be)} & 2 & [He]2s^{2}\\ \cline{1-4} 5 & Boron \bf{(B)} &3 &[He]2s^{2}2p^1 \\ \cline{1-4} 6 & Carbon \bf{(C)} & 4 & [He]2s^{2}1p^{2}\\ \cline{1-4} 7 &Nitrogen \bf{(N)} & 3 & [He]2s^{2}1p^{3}\\ \cline{1-4} 8 & Oxygen \bf{(O)} & 2 &[He]2s^{2}1p^{4}\\ \cline{1-4} 9 & Fluorine \bf{(F)} & 1 & [He]2s^{2}1p^{5}\\ \cline{1-4} 10 & Neon \bf{(Ne)} & 0 & [He]2s^{2}1p^{6}\\ \cline{1-4}\cline{1-4}\end{array}$

$\begin{array}{| c | c | c | c |}\cline{1-4} \sf Atomic\:No.&\sf Elements& \sf Valency&\sf Electronic\ configuration \\ \cline{1-4} 11 & Sodium \bf{(Na)} & 1& [Ne]3s^{1} \\ \cline{1-4} 12 & Magnesium \bf{(Mg)} & 2 & [Ne]3s^{2}\\ \cline{1-4} 13 & Aluminium \bf{(Al)} & 3 & [Ne]3s^{2}3p^{1}\\ \cline{1-4} 14 & Silicon \bf{(Si)} & 4 &[Ne]3s^{2}3p^{2}\\ \cline{1-4}15 & Phosphorus \bf{(P)} & 3& [Ne]3s^{2}3p^{3}\\ \cline{1-4} 16 & Sulphur \bf{(S)} & 2 &[Ne]3s^{2}3p^{4}\\ \cline{1-4}17 & Chlorine \bf{(Cl)} & 1&[Ne]3s^{2}3p^{5} \\ \cline{1-4} 18 & Argon \bf{(Ar)} & 0 & [Ne]3s^{2}3p^{6} \\ \cline{1-4}19 & Potassium \bf{(K)} & 1 & [Ar]4s^{1}\\ \cline{1-4} 20 & Calcium \bf{(Ca)}& 2 &[Ar]4s^{2}\\ \cline{1-4}\end{array}$

$\begin{array}{| c | c | c | c |}\cline{1-4} \sf Atomic\:No.&\sf Elements& \sf Valency&\sf Electronic\ configuration \\ \cline{1-4} 21 & Scandium \bf{(Sc)} & 3 & [Ar]4s^{2}3d^{1}\\ \cline{1-4} 22 & Titanium \bf{(Ti)}& 4&[Ar]4s^{2}3d^{2} \\ \cline{1-4} 23 & Vanadium \bf{(V)} & 5,4 &[Ar]4s^{2}3d^{3}\\ \cline{1-4} 24 & Chromium \bf{(Cr)} & 2 & [Ar]4s^{1}3d^{5} \\ \cline{1-4} 25 & Manganese \bf{(Mn)} &7,4,2&[Ar]4s^{2}3d^{5}  \\ \cline{1-4} 26 & Iron \bf{(Fe)}&2,3&[Ar]4s^{2}3d^{6}  \\ \cline{1-4} 27 & Cobalt \bf{(Co)} & 2 &[Ar]4s^{2}3d^{7} \\ \cline{1-4} 28 &Nickel \bf{(Ni)} &3,2 &[Ar]4s^{2}3d^{8} \\ \cline{1-4} 29 &Copper \bf{(Cu)} &2,1 & [Ar]4s^{1}3d^{10} \\ \cline{1-4} 30& Zinc \bf{(Zn)} &2&[Ar]4s^{2}3d^{10} \\ \cline{1-4}\end{array}$