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Which of the following gaseous atoms has highest value of IE ?
Since, stable half filled configuration.
In which of the following process highest energy is absorbed?
In Cu it has completely filled d-orbital so highest energy is absorbed when it convert in Cu+ ion
Highest energy will be absorbed to eject out the electron in the configuration
Due to high stability of half-filled orbitals.
If 19 is the atomic number of an element, then this element will be
As atomic number, number 19 falls within group I of modern periodic table so it is an alkali metal with + 1 oxidation state.
The outer electronic configuration of transition elements is
(n – 1) s2p6(n – 1)d1–10ns0–2 represents the correct electronic configuration of transition elements among the given choices.
Which of the following element has maximum, first ionisation potential ?
The correct order according to size is
(i)The anion is always larger in size as compared to corresponding neutral atom.
(ii)Greater the magnitude of negative charge, larger will be the size.Therefore,the correct order of size is O2– > O– > O
Which of the following pairs of atomic numbers represents elements belonging to the same group?
The correct order of ionization energy for carbon,nitrogen and oxygen atoms is:
The ionization energy increases with decrease in size.Further the element having stable configuration has higher ionisation energy than expected.Hence the ionization energy of nitrogen (Z = 7) is more than oxygen(Z = 8) and carbon (Z = 6) because it has half-filled p-orbitals.
6C = 1s22s22p2 ; 7N= 1s22s22p3 ; 8O = 1s22s22p4
Hence the correct order should be C < N > O
Which of the following has minimum melting point?
Ionic compounds have high melting point. Greater the ionic character, more is melting point. HCl has least ionic character because of maximum electronegativity difference between the two constituent elements, Hand Cl among CsF, HCl, HF and LiF
∴ HCl has minimum melting point.