Which of the following order is not in accordance with the property stated against it ?
(a) F2 > Cl2 > Br2 > l2 Oxidising Power
(b) Hl > HBr >HCl >HF Acidic property in water
(c) F2 > Cl2 > Br2 > l2 Electronegativity
(d) F2 > Cl2 > Br2 > l2 Bond dissociation energy
SInce size increases down the period , thus bond dissociation energy decreases.
An element X occurs in short period having configuration ns2np1 . The formula and nature of its oxide are:
(a) XO3, basic
(b) XO3, acidic
(c) X2O3, amphoteric
(d) X2O3, basic
(c) B2O3, 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.
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.
Which statement is true?
(1) the electronegative nature of elements increases along the period
(2) the electropositive nature of elements increases along the period
(3) the chemical reactivity of elements increases along the period
(4) the chemical reactivity of element decreases along the period
(1) it is a fact.