The first ionisation potential of Na, Mg, Al and Si are in the order
Na < Mg > Al < Si
Na > Mg > Al > Si
Na < Mg < Al > Si
Na > Mg > Al < Si
Elements of which group form anions most readily?
Oxygen group
Nitrogen group
Halogens
Alkali metals
Indicate the pair whose one member has the highest and other has the lowest electronegativity
I and F
Fr and Li
K and Cs
F and Fr
Atomic numbers of elements X, Y and Z are 50, 78 and 60 respectively. These elements are placed in modem long form of Periodic Table respectively in
p-block, d-block and f-block
p-block, d-block and s-block
s-block, p-block and d-block
s-block, d-block and f-block
What is the electronic configuration of O2- ion?
1s2, 2s2, 2p5, 3s1
1s2, 2s2, 2p4, 3s2
1s2, 2s2, 2p6
1s2, 2s2, 2p4
Among the following groupings which represent the collection of isoelectronic species.
NO+, C, C, CO
N2, C, CO, NO
CO, NO+, CN-, C
NO, CN-, N2, O
Which element has maximum first ionisation potential?
Cs
F
Na
He
D.
He
Atoms and ions having inert gas configuration (such as helmm), i.e. stable (half-filled) configuration have high ionisation potential, i.e. it is relatively easy to remove an electron from a partially filled valence shell, where Zeff is lower but it is relatively difficult to remove an electron from an atom or ion that has a filled valence shell, where Zeff is higher.