Which of the following has the highest electron affinity?
F-
O-
O
Na
Electronic configuration of an element 'x' having atomic number 24 is
[Ne]2p53s1
[Ar] 3d64s2
[Ar]3d44s2
[Ar]3d54s1
The ionisation energy will be maximum for
Be
Li
B
H
The element with atomic number 36 belongs to _______ block in the periodic table.
p
s
f
d
Which of the following have highest melting point ?
p- block elements
s- block elements
d- block elements
none of these
Correct order of raddi is
Na < Be < B
F- < O2 - < N 3-
Na < Li < K
Fe3+ < Fe2+ < Fe4+
Which is the property of non-metal?
Electronegative
Basic nature of oxide
Reducing property
Low ionisation potential
The number of elements present in fifth period of periodic table is
10
8
32
18
_________ has highest electronegativity.
F
Br
Cl
I
Which of the following represents the correct order increasing electron gain enthalpy ?
S< O < Cl < F
Cl < F < O < S
O < S < F < Cl
F < S < O < Cl
