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
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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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Which electronic configurations represent to a transition element?

(a) 1s2, 2s2 2p6, 3s23p63d10, 4s24p6

(b) 1s2, 2s2 2p6, 3s23p63d10, 4s24p1

(c) 1s2, 2s2 2p6, 3s23p63d10, 4s2

(d) 1s2, 2s2 2p6, 3s23p6, 4s2

Concept Questions :-

Electronic Configuration
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Low melting point of manganese in the 1st transition series is due to:

(a) strong metallic bond due to d10 configuration

(b) weak metallic bond due to d5 configuration

(c) weak metallic bond due to d7 configuration

(d) none of the above

Concept Questions :-

Lattice/Hydration Energy
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