Question

Element in period 3 with highest electric conductivity

Answer 1

Period 3, or the third period, refers to the third row from the top of the periodic table.

The elements in period 3 of the periodic table are:

Name of Elementsodiummagnesiumaluminium (1)siliconphosphorussulfur (2)chlorineargonChemical SymbolNaMgAlSiPSClAr

The following general trends are observed as you go across period 3 from left to right:

(a) atomic number, and therefore charge on the nucleus (nuclear or core charge) increases

(b) number of valence electrons increases

(c) atomic radiusdecreases

(d) first ionisation energyincreases

(f) electronegativityincreases (excluding argon)

(g) elements on the left are metals, elements on the right are non-metals:

(i) melting points change from high to low

(ii) boiling points change from high to low

(iii) electrical and heat conductors on the left to insulators on the right

(iv) metallic lustre on the left to dull on the right

(v) colour changes from grey on the left to coloured on the right 
            (except argon which is colourless)

(vi) Properties of the chlorides:

(I) bond type: ionicchlorides on the left to covalentchlorides on the right

(II) aqueous solutions: neutral on the left to acidic on the right

(vii) Properties of the oxides:

(I) bond type: ionic on the left to covalent on the right

(II) aqueous solutions: basic on the left to amphoteric to acidic on the right

The general trends in the properties of period 3 elements are summarised in the table below:

Period 3 ElementsNaMgAlSiPSClArTrend: Atomic Number (Z)low→→→→→→highTrend: No. Electronslow→→→→→→highTrend: Atomic Radiuslargest→→→→→→smallestgeneral Trend: 1st Ionisation Energylowest→→→→→→highestTrend: Electronegativitylowest→→→→→highestnoneGeneral Melting PointhigherhighestlowerPhysical Descriptionshiny-grey "metallic" soliddull grey solidwhite solidyellow solidgreenish-yellow gascolourless gasMetallic Charactermetalssemi-metal
(metalloid)non-metalsBonding in ChloridesioniccovalentnoneAcidity of ChloridesneutralacidicnoneBonding in Oxidesioniccovalent
(3-D network)covalent molecularnoneAcidity of Oxidesbasic

Answer 2

Answer:

Maybe Argon

Explanation:

Argon has 18 electrons, the more the number of electrons, the higher electricity conductivity.  

Hope this helps with your question. :)