The `2^(nd)` group element the least density is:

(A) Be
(B) Mg
(C) Ca
(D) Ba

IIIA group element with highest density is

The most electropositive element is (A)NA (B)Cu (C)Cs (D)Ca

The element with the least electronegativity is: A: Lithium B: Carbon C: Boron D: Fluorine

The least prime number is (a)1 (b)2 (c)3 (d)5

Among group 14 elements , …………….. Has the least tendency to undergo catention .

Metal present in cytochrome oxidase is (a) Cu (b) Fe (c) Mg (d) Ca

Can the following groups of elements be classified as Dobereiner's triad: {:("(a) Na, Si, Cl"," (b) Be, Mg, Ca"):} Atomic mass of Be-9, Na-23, Mg-24, Si-28, Cl-35, Ca-40. Justify your answer in each case.

Which has the largest ionic radius Ca^(2+) , Mg^(2+) , Ba^(2+) ?

Can the following groups of elements be classified as Dobereiner's triad ? (a) Na, Si, Cl (b) Be, Mg, Ca Atomic mass of Be 9 , Na 23 , Mg 24 , Si 28 , Cl 35 , Ca 40 Explain by giving reason.

Assertion : 2^(nd) period elements do not involve in excitation of electron. Reason : 2^(nd) period elements do not have vacant 2d-orbitals.