The pair in which ionisation energy of the first species is less than that of the second is _______
N,P
N,N-
Be+, Be
S,P
Metals, non- metals and metalloids are present in
d- block
f- block
s- block
p- block
The Size of I, I+ and I- follow the order __________.
I+> I-> I
I-> I+ >I
I-> I>I+
I+>I>I-
Diagonal relationship is shown by
f- block elements
elements of second period
d- block elements
elements of first period
The element that does not show positive oxidation state in its compounds is
Xe
Cl
O
F
Out of the following the atomic number of the element having highest vapour pressure at room temperature is
Z=25
Z=48
Z=30
Z=80
If 'x' denotes the number of valence electrons of an element, its valency equals________
X
x-8
8-x
either (a) or (c)
Which of the following contains maximum number of unpaired electrons ?
Co
Ni
Cr
Fe
Incompletely filled orbitals in representative elements are
d-only
f-only
both d and f
s and p
Electron affinity depends on
Atomic size
Nuclear charge
Atomic number
Both atomic size and nuclear charge
