Identify the correct electronic configuration of Cr (Z=24)
1s2, 2s2, 2p6, 3s2, 3p6, 3d7, 4s1
1s2, 2s2, 2p6, 3s2, 3p6, 3d5, 4s2
1S2, 2s2, 2P6, S2, 3P6, 3d7, 4s2
1S2, 2S2, 2P6, 3S2, 3P6, 3d6, 4S2
The element with atomic number 36 belongs to _______ block in the periodic table.
p
s
f
d
______ is defined as the tendency of an atom in a molecule to attract the shared pair of electrons towards itself
Electropositivity
Electronegativity
Electron gain enthalpy
Electron affinity
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+
The ionisation energy will be maximum for
Be
Li
B
H
Which one of the following is not a chalcogen?
S
Se
O
Na
Pick the correct answer,
according to the periodic law of elements ,the variation in properties of elements is related to their,
atomic masses
nuclear masses
atomic number
nuclear neutron -proton ratios
The element with lowest ionisation potential is
K
Rb
Cs
Name the element having atomic number 105.
Kurchatovium
Dubnium
Nobelium
Holmium
