Which represents the electronic configuration of the most electropositive element?

(1)[He]2s1

(2)[Xe]6s1

(3)[He]2s2

(4)[Xe]6s2

Concept Questions :-

Electronic Configuration
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An element X is placed in group IA of the perodic table because it forms:

(a) an oxide which is acid

(b) a volatile chloride having formula XCl2

(c) an ionic chloride having formula XCl

(d) an insoluble chloride XCl4

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Which one of the following is an amphoteric oxide?

(a) SO2

(b) B2O3

(c) ZnO

(d) Na2O

Concept Questions :-

Nature of Compound
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Elements which generally exhibit multiple oxidation states and whose ions in aqueous medium are usually coloured aand whose ions in aqueous medium are usually coloured are:

(a) metalloids

(b) transition elements

(c) non-metals

(d) gases

Concept Questions :-

Modern Periodic Table
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Transition elements exhibit variable oxidation states because they release electrons from the following orbits:

(a) ns and np orbits

(b) (n-1)d and ns orbits

(c) (n-1)d orbits

(d) ns orbits

 

Concept Questions :-

Modern Periodic Table
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In II period most acidic oxide is formed by:

(a) F

(b) N

(c) O

(d) Li

Concept Questions :-

Nature of Compound
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Elements of group IB and IIB are called:

(a) normal elements

(b) transition elements

(c) alkaline earth metals

(d) alkali metals

Concept Questions :-

Modern Periodic Table
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Which element has the greatest tendency to lose electron?

(a) F

(b) Fr

(c) S

(d) Be

 

Concept Questions :-

Ionization Energy (IE)
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The outer electron configuration of Gd (Atomic no. 64) is:

(a) 4f3 5d56d2

(b) 4f8 5d106d2

(c) 4f4 5d46d2

(d) 4f7 5d16s2

Concept Questions :-

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The radius of La3+ (at. no. 57) is 1.06 A° The radius of Lu3+ (at.no. 71) might be:

(a) 1.06  A°

(b) 0.85  A°

(c) 1.60  A°

(d) 1.40  A°

Concept Questions :-

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