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
C.
Halogens
Higher the electron gain enthalpy (with negative sign), higher is the tendency of an element to form anion. Electron gain enthalpy is highest for halogens, thus halogens form anions most readily.
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