correct increasing order of density is:

(1)Li<K<Na<Rb<Cs

(2))Li<Na<K<Rb<Cs

(3)Cs<Rb<K<Na<Li

(4)K<Li<Na<Rb<Cs

Concept Questions :-

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General electronic configuration of outermost and penultimate shell of an atom is
(- 1)s2 (n - 1) p6 (- 1)dx ns2. If n = 4 and x = 5, the number of proton in the nucleus is:

(a) > 25

(b) < 24

(c) 25

(d) 30

Concept Questions :-

Electronic Configuration
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The maximum number of valency electrons possible for atoms in the second period of the periodic table is:

(a) 18

(b) 10

(c) 8

(d) 2

Concept Questions :-

Electronic Configuration
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If a certain element has an atomic number 19, the element is:

(a) an inert gas

(b) a metal with oxidation number +1

(c) a non-metal with oxidation number -3

(d) a metal with oxidation number -3

Concept Questions :-

Electronic Configuration
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Which of the following has the least density?

(1)Na

(2)Li

(3)Mg

(4)K

Concept Questions :-

Modern Periodic Table
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Eka aluminium and eka silicon are now known as:

(a) Ga and Ge

(b) Al and Si

(c) Fe and S

(d) H+ and Si

Concept Questions :-

Modern Periodic Table
Please attempt this question first.

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An element having the electronic configuration of its atom ns2 np2 should have similar properties to those of:

(a) sodium

(b) carbon

(c) magnesium

(d) oxygen

Concept Questions :-

Electronic Configuration
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The order of basic character of given oxides is:

(a) Na2O > MgO > Al2O3 > CuO

(b) MgO > Al2O3 > CuO > Na2O

(c) Al2O3 > MgO > CuO > Na2O

(d) CuO > Na2O > MgO > Al2O3

Concept Questions :-

Stability of Compound
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Variable valency is shown by:

(a) Na

(b) Cu

(c) Mg

(d) Al

Concept Questions :-

Modern Periodic Table
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the lightest metal in the periodic table is:

(1)H

(2)Mg

(3)Ca

(4)Li

Concept Questions :-

Modern Periodic Table
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