Generally the ionization enthalpy in a period increase but there are some exceptions. The one which is not an exception is-

(1) Be and B

(2) N and O

(3) Mg and Al

(4) Na and Mg

Concept Questions :-

Ionization Energy (IE)
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Sodium generally does not show oxidation state of +2, because of its:

(1) High first ionization potential

(2) High second ionization potential

(3) Large ionic radius

(4) High electronegativity

Concept Questions :-

Electronic Configuration
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the electronegativity of the following elements increases in the order

(1) S<P<N<O   

(2)P<S<N<O

(3)N<O<P<S

(4) N<P<S<O

Concept Questions :-

Electronegativity
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The graph of first ionization enthalpy versus atomic number as follows:

Which of the following statement is correct?

(1) Alkali metals are at the maxima and noble gases at the minima.

(2) Noble gases are at the maxima and alkali metals at the minima.

(3) Transition element are at the maxima.

(4) Minima and Maxima do not show any regular behaviour.

Concept Questions :-

Modern Periodic Table
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What are the combining ratios of elements in group l with elements in group VII of the periodic table ?

(1) 1 : 2

(2) 1 : 3

(3) 2 : 1

(4) 1 : 1

Concept Questions :-

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The electronic configuration of the element which is just above the element with atomic 43 in the same group is ____________.

(1) 1s2s2p3s3p3d4s2

(2) 1s2s2p3s3p3d5 4s3 4p6

(3) 1s2s2p3s3p3d6 4s2

(4) 1s2s2p3s3p3d7 4s2

Concept Questions :-

Electronic Configuration
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The correct order of second ionization potential of carbon, nitrogen, oxygen and fluorine is

(1) C > N > O > F

(2) O > N > F > C

(3) O > F > N > C

(4) F > O > N > C

Concept Questions :-

Ionization Energy (IE)
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Which of the following statement is correct with respect to the property of elements with increase in atomic number in carbon family.

(1) Their metallic character decreases

(2) The stability of +2 oxidation state increases

(3) Their ionisation energy increases

(4) Their atomic size decreases

 

Concept Questions :-

Modern Periodic Table
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The correct arrangement of increasing order of atomic radius among Na, K, Mg and Rb is 

(1) Mg<K<Na<Rb

(2) Mg<Na<K<Rb

(3) Mg<Na<Rb<K

(4) Na<K<Rb<Mg

Concept Questions :-

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Chloride of an  element A gave a neutral solution in water. In the periodic table the element A belongs to

(1) First group

(2) Third group

(3) Fifth group

(4) Transitional metal

Concept Questions :-

Stability of Compound
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