Which of the following orders regarding ionisation energy is correct?
N > O > F
N < O < F
N > O < F
N < O < F
The electronic configuration 1s2, 2s22p6, 3s23p63d9 represents a
metal atom
non metal atom
non-metallic anion
metallic cation
In a given shell the order of screening effect is
s > p > d > f
s > p > f > d
f > d > p > s
s < p < d < f
The ionisation energy of hydrogen atom is 13.6eV. What will be the ionisation energy of He+?
13.6 eV
54.4 eV
122.4 eV
Zero
The correct order of radii is
N <Be <B
F-<O2-<N3-
Na< Li< K
Fe3+< Fe2+< Fe4+
B.
F-<O2-<N3-
These are isoelectronic species and their radii decreases with increasing their atomic number due to increasing effective nuclear charge (Zeff).
where, Zeff = effective nuclear charge, Z= atomic number and = screening constant. For F-, O2- and N3-, the value of is the constant due to equal number of electron. So order of Zeff is F > O2-> N3-, hence, order of radii is