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Which of the following order is not in accordance with the property stated against it ?
SInce size increases down the period , thus bond dissociation energy decreases, F2 is exception to this trend.
An element X occurs in short period having configuration ns2np1 . The formula and nature of its oxide are:
(c) Al2O3 are amphoteric oxides
Newland's Octaves Law -
Arranged the element in increasing order of their atomic weight and found that every eighth element had properties similar to that of the first element. Law of Octave was found to be true upto calcium.
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An element having configuration ns2 np1 will show +3 OS and its oxide nature will be that of its group i.e. Baron, Aluminium, etc.
therefore X2O3, and amphoteric nature. B2O3 is acidic , but tht is not in option , so only 3 is right ans.
The outermost electronic configuration of the most electronegative element is :
(c) It belongs to general outer electronic configuration of halogens which are most electronegative elements.
The elements X, Y, Z and J have the indicated electron configurations starting with the innermost shell. The most metallic element is :
(c) The metallic character is maximum in I gp. elements.
Which statement is true?
EN increase along the period
The most non-metallic element among the following is:
(b) Non-metallic character increases along the period and decreases down the gp.
58Ce is a member of:
(d) Elements from atomic number 58 to 71 are f-block elements and are known as Lanthanoids or rare earths.
The screening effect of 'd' electrons is :
(a) Screening effect order for sub-shell is of a shell, s>p>d>f.
Transuranic elements are those which are:
(a) trans means later so complete meaning is after uranium.
correct increasing order of density is:
K is lighter than Na.
k,Ca have lower density than Na,Mg,Because thy (K,Ca) have vacent d subshell,which increase their size.
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