Match the following elements, given as hints to their first, second ionization enthalpies and electron gain enthalpies. List- I List- II i ) Most reactive non-metal A ) ∆ H 1 = 419 , ∆ H 2 = 3051 , ∆ Eg H = - 48 ii ) Most reactive metal B ) ∆ H 1 = 1681 , ∆ H 2 = 3374 , ∆ Eg H = - 328 iii ) Least reactive element C ) ∆ H 1 = 738 , ∆ H 2 = 1451 , ∆ Eg H = - 40 iv ) Metal forming binary halide D ) ∆ H 1 = 3272 , ∆ H 2 = 5251 , ∆ Eg H = + 48

( i - B ) , ( i i - A ) , ( i i i - D ) , ( i v - C )

( i - A ) , ( i i - B ) , ( i i i - D ) , ( i v - C )

( i - B ) , ( i i - A ) , ( i i i - C ) , ( i v - D )

( i - B ) , ( i i - D ) , ( i i i - A ) , ( i v - C )

Match List- I with List- II . List- I Electronic configuration of elements List- II Δ i H in kJ mol - 1 a 1 s 2 2 s 2 p 801 b 1 s 2 2 s 2 2 p 4 q 899 c 1 s 2 2 s 2 2 p 3 r 1314 d 1 s 2 2 s 2 2 p 1 s 1402 Choose the most appropriate answer from the options given below:

a → q , b → r , c → s , d → p

a → p , b → r , c → s , d → q

a → p , b → s , c → r , d → q

a → s , b → p , c → q , d → r

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The successive enthalpies are always lower than the first ionization enthalpy.

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Important Questions on Electrons in Atoms

EASY

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

The first ionization enthalpy of the following elements are in the order:

MEDIUM

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

The element having the greatest difference between its first and second ionization energies, is

MEDIUM

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

The first ionization energy (in

k J / m o l

) of

N a, M g, A l

and

S i

respectively are:

MEDIUM

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

Calculate the energy needed to convert three moles of sodium atoms in the gaseous state into sodium ions. The ionization energy of sodium is

495 kJ {mol}^{- 1}

EASY

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

The electronic configuration with the highest ionization enthalpy is:

EASY

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

The process that is NOT endothermic in nature is :

MEDIUM

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

For the second period elements the correct increasing order of first ionization enthalpy is:

MEDIUM

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

Atomic numbers of Vanadium, Chromium, Nickel and Iron are

23, 24, 28

and

26

respectively. Which one of these is been expected to have the highest second ionization enthalpy?

EASY

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

The electronic configuration of an element with the largest difference between the

1^{s t}

and

2^{n d}

ionization energies is

EASY

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

Which of the following atoms has the highest first ionization energy?

MEDIUM

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

Match the following elements, given as hints to their first, second ionization enthalpies and
electron gain enthalpies.

List- $I$	List- $II$
$i)$ Most reactive non-metal	$A)$ $∆ H_{1} = 419, ∆ H_{2} = 3051, ∆_{Eg} H = - 48$
$ii)$ Most reactive metal	$B)$ $∆ H_{1} = 1681, ∆ H_{2} = 3374, ∆_{Eg} H = - 328$
$iii)$ Least reactive element	$C)$ $∆ H_{1} = 738, ∆ H_{2} = 1451, ∆_{Eg} H = - 40$
$iv)$ Metal forming binary halide	$D)$ $∆ H_{1} = 3272, ∆ H_{2} = 5251, ∆_{Eg} H = + 48$

MEDIUM

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

Which of the following represents the correct order of increasing first ionization enthalpy for

Ca, Ba, S, Se and Ar

MEDIUM

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

In second period of the long form of periodic table, identify the pair of elements which have exceptionally high ionisation enthalpies than expected

EASY

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

The five successive ionization enthalpies of an element are

800, 2427, 3658, 35024 32824 kJ {mol}^{- 1}

. The number of valence electrons in the element is:

MEDIUM

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

Arrange the following in the correct order of their ionization enthalpies:

$Li, Be, B, N, O$

EASY

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

Match List- $I$ with List- $II$ .

	List- $I$ Electronic configuration of elements		List- $II$ $Δ_{i} H$ in $kJ {mol}^{- 1}$
$(a)$	$1 s^{2} 2 s^{2}$	$(p)$	$801$
$(b)$	$1 s^{2} 2 s^{2} 2 p^{4}$	$(q)$	$899$
$(c)$	$1 s^{2} 2 s^{2} 2 p^{3}$	$(r)$	$1314$
$(d)$	$1 s^{2} 2 s^{2} 2 p^{1}$	$(s)$	$1402$

Choose the most appropriate answer from the options given below:

EASY

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

The first ionization potential

(IP)

of the elements

Na, Mg, Si, P, Cl

and

Ar

are

5.14, 7.65, 8.15 10.49, 12.97

and

15.76 eV,

respectively. The

IP

(in

eV

) of

K

is closest to :

MEDIUM

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

Give a reason for the following.

Ionisation potential increases across a period, from left to right.

EASY

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

The first ionization enthalpies for three elements are

1314, 1680

and

2080 kJ {mol}^{- 1}

, respectively. The correct sequence of the element is:

MEDIUM

Chemistry>Physical Chemistry>Electrons in Atoms>Evidence for Electronic Structure

In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

The successive enthalpies are always lower than the first ionization enthalpy.

Important Questions on Electrons in Atoms

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