Single Choice

Which of the following has the lowest ionisation enthalpy?

A$$ 4s^1 $$
Correct Answer
B$$ 3d^2 $$
C$$ 3p^6 $$
D$$ 2p^6 $$

Solution

Answer A
4s1 has the lowest ionization enthalpy as only one electron is to be remove to attain a stable configuration.

SIMILAR QUESTIONS

Periodic Classification of Elements

The ionization energy of nitrogen is more than that of oxygen because :

Periodic Classification of Elements

Which of the following elements has the highest ionization energy?

Periodic Classification of Elements

The factors that influence the ionisation energies are :

Periodic Classification of Elements

Which one of the following elements has the highest first ionization potential?

Periodic Classification of Elements

Gradual addition of electronic shells in the noble gases causes a decrease in their:

Periodic Classification of Elements

Which one of the following statements is incorrect in relation to ionization enthalpy? (a) Ionization enthalpy increases for each successive electron. (b) The greatest increases in ionization enthalpy is experienced on removal of electron from core noble gas configuration. (c) End of valence electrons is marked by a big jump in ionization enthalpy. (d) Removal of electron from orbitals bearing lower n value is easier than from orbital having higher n value.

Periodic Classification of Elements

The first ($$\Delta H_{1}$$) and second ($$\Delta H_{2}$$) ionisation enthalpies (in $$kJ mol^{-1}$$) and the electron gain enthalpy ($$\Delta_{eg}H$$) (in $$kJ mol^{-1}$$) of the elements I, II, III, IV and V are given below: Element $$\Delta_{1}H_{1}$$ $$\Delta_{1}H_{2}$$ $$\Delta_{eg}H$$ I 520 7300 -60 II 419 3051 -48 II 1681 3374 -328 IV 1008 1846 -295 V 2372 5251 +48 The most reactive metal and the least reactive non-metal of these are respectively.

Periodic Classification of Elements

Nuclear charge increases in a period as well as group. However, periodic properties such as atomic size and IP show a reverse trend. Why?

Periodic Classification of Elements

Gradual addition of electronic shells in the noble gases causes a decrease in their:

Periodic Classification of Elements

Poor shielding of nuclear charge by d or f-orbital electrons is responsible for which of the following facts?

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