Elements with electronic configuration 1s2,2s22p6, 3s23p63d10, 4s24p64d10, 5s25p3 belongs to the ...... group of periodic table.

(a) 3rd

(b) 15th

(c) 17th

(d) 12nd

Concept Questions :-

Electronic Configuration
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Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?

(a)3d3,4s2

(b)3d5,4s1

(c)3d5,4s2

(d)3d2,4s2

 

Concept Questions :-

Electronic Configuration
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The law of triads applicable to a group of:

(a) Cl, Br, I

(b) C, N, O

(c) Na, K, Rb

(d) H, O, N

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In the long form of periodic table all the non-metals are placed under:

(a) s-block

(b) p-block

(c) f-block

(d) d-block

Concept Questions :-

Modern Periodic Table
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General electronic configuration of the transition elements is given by:

(a) ns2nd1-10

(b) ns2np6nd1-10

(c) (n-1)d1-10np6

(d) (n-1)d1-10ns0-2

 

Concept Questions :-

Electronic Configuration
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The statements that is not correct for the periodic classification of elements is:

(a) the properties of elements are the periodic functions of their atomic number

(b) non-metallic elements are lesser in number that metallic elements

(c) the first ionization energies of elements along a period do not vary in a regular manner with increase in atomic number

(d) for transition elements, the d-sub-shells are filled with electrons monotonically with the increase in atomic number.

Concept Questions :-

Electronic Configuration
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Which of the following is not a metal?

(a) Gold

(b) mercury

(c) Scandium

(d) Selenium

Concept Questions :-

Modern Periodic Table
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The ions O2-, F-, Na+, Mg2+ and Al3+ are isoelectronic. Their ionic radii show [2003]

(a) an increase from O2- to F- and then decrease from Na+ to Al3+

(b) a decrease from O2- to F- and then increase from Na+ to Al3+

(c) a significant increase from O2- to Al3+

(d) a significant decrease from O2- to Al3+

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The example of metalloid elements in the periodic table is:

(a) Na and K

(b) Cu and Al

(c) B and Si

(d) Ca and Mg

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The element with atomic number 26 is:

(a) a non-metal

(b) krypton

(c) iron

(d) manganese

 

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