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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If all the ${II}^{nd}$ period elements are arranged in decreasing order of ${IE}_{2}$ . Iithium is present on $n^{th}$ position.

What is $' n'$ .

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Important Questions on Classification of Elements and Periodicity in Properties

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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:

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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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

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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

The first ionization energy (in

k J / m o l

) of

N a, M g, A l

and

S i

respectively are:

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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	$D)$ $∆ H_{1} = 3272, ∆ H_{2} = 5251, ∆_{Eg} H = + 48$

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

The electronic configuration with the highest ionization enthalpy is:

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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}

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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

Elements which have relatively high ionisation energy and occur as sulphides are

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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

1^{s t}

and

2^{n d}

ionization energies is

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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

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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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

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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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

Ca, Ba, S, Se and Ar

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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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

$Li, Be, B, N, O$

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

The process that is NOT endothermic in nature is :

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

How does the ionisation energy of

1 st

group elements vary ?

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

Give a reason for the following.

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

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

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

If all the IInd period elements are arranged in decreasing order of IE2. Iithium is present on nth position. What is 'n'.

Important Questions on Classification of Elements and Periodicity in Properties

Learn and Prepare for any exam you want !

If all the ${II}^{nd}$ period elements are arranged in decreasing order of ${IE}_{2}$ . Iithium is present on $n^{th}$ position.

What is $' n'$ .