2. Which of the following talerest The eftective auctear charge experienced by a

Question

2. Which of the following talerest The eftective auctear charge experienced by an electron in as outer shell i le that the Within family (vertkal group in periodic tablehof radii increise fron top bottom. in imer shen screen or shield, doctrons in outer shells fron the full effect of the nuclear charge. d The atomic radi of representative eloments decrease from left la right (horizontal rou in the lements have larger atomie radii than the precediag IA and IIA elements is in their d orbitals the dine period because transition elements have electrons whkh one following specics The mini energy required remove the most loosely held electron is first ioaiani on energy.

Explanation / Answer

3Q answer is Si2+

target need to find species not isoelectronic with neon

Neon atomic number is 10

option check

option a =  magnesium atomic number is 12 = Mg +2 = 10 = isoelectronic

option b = sodium atomic number is 11 = Na+ = 10 = isoelectronic

option c = oxygen atomic number is 8 = O-2 = 10 = isolectronic

oprtion d = silicon atomic number is 14 = Si+2 = 12 = not isoelctronic

option e = aluminium atomic number is 13 = Al+3 = 10 = isoelectronic

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