The effective nuclear charge of an atom depends upon
atomic number and nuclear charge
shielding effect
atomic number and shielding effect
shielding effect and nuclear charge
The pair having both members from the same period of the periodic table is
Na,Cl
Na, Ca
Ca,Cl
Cl, Br
The number of periods in the long form of the periodic table is ___________
Nine
Eighteen
Seven
As many as groups
Which of the following is not a Dobereiner triad ?
Li, Na, K
Cl, Br, I
Fe, Co, Ni
Ca, Sr, Ba
The correct order of decreasing ionic character is ________
Bacl2 >Mgcl2> Cacl2> Be cl2
Cacl2> Mgcl2>Becl2>Bacl2
Bacl2>Cacl2>Mgcl2> Becl2
Bacl2>Becl2>Cacl2> Mgcl2
The attempt for classifying elements by plotting the atomic weights of elements against the volume was made by _______
Newland
Doebereinier
Mendeleev
Lother Meyer
The block and period in the periodic table of the element having the IUPAC symbol Uub is
f- block, 7th period
d- block, 7th period
f- block, 8th period
p- block, 7th period
The element which forms an amphoteric oxide is
Barium
Calcium
Chlorine
Beryllium
Which of the following contains maximum number of unpaired electrons ?
Co
Ni
Cr
Fe
Out of the following ________ is not isoelectronic
Mg2+
Cl-
Na+
O2-
