Classification of Elements and Periodicity in Properties Set-1

Question 1

What physical property did Henry Moseley, in 1913, correlate with the characteristic X-ray spectra of elements to prove that atomic number ($Z$) is a more fundamental property than atomic mass?

Accepted Answer

Frequency ($
u$) of emitted X-rays

Answer

Density

Answer

Melting point

Answer

Atomic volume

Question 2

Which chemist noted a similarity among the physical and chemical properties of groups of three elements, known as triads, in the early 1800s?

Accepted Answer

Johann Dobereiner

Answer

Lothar Meyer

Answer

Dmitri Mendeleev

Answer

John Alexander Newlands

Question 3

Mendeleev's Periodic Law stated that the properties of the elements are a periodic function of their:

Accepted Answer

Atomic weights

Answer

Atomic numbers

Answer

Electron gain enthalpies

Answer

Ionization energies

Question 4

John Alexander Newlands profounded the Law of Octaves in 1865. This law suggested that every eighth element had properties similar to the first element when arranged by increasing order of:

Accepted Answer

Atomic weights

Answer

Atomic number

Answer

Boiling point

Answer

Valence

Question 5

Which elements, in addition to actinium and protoactinium, were found in pitchblende, an ore of uranium, stimulating renewed interest in Inorganic Chemistry?

Accepted Answer

Neptunium and plutonium

Answer

Gallium and Germanium

Answer

Cerium and Lutetium

Answer

Sodium and Potassium

Question 6

The Modern Periodic Law, which modified Mendeleev’s law, states that the physical and chemical properties of the elements are periodic functions of their:

Accepted Answer

Atomic numbers

Answer

Atomic masses

Answer

Neutron numbers

Answer

Molecular weights

Question 7

The horizontal rows in the Modern Periodic Table are known as:

Accepted Answer

Periods

Answer

Groups

Answer

Series (Mendeleev's term)

Answer

Blocks

Question 8

According to the recommendation of the International Union of Pure and Applied Chemistry (IUPAC), how are the vertical columns (groups) in the Modern Periodic Table numbered?

Accepted Answer

1 to 18

Answer

I to VIIA, VIII, and IB to VIIB

Answer

1 to 7

Answer

1 to 10

Question 9

The element Iodine ($	ext{I}$) has a lower atomic weight than Tellurium ($	ext{Te}$). Mendeleev ignored the order of atomic weights and placed Iodine in Group VII along with Fluorine and Chlorine. This decision was based on:

Accepted Answer

Similarities in properties and empirical formulas of compounds

Answer

The higher density of Iodine

Answer

The lower melting point of Iodine

Answer

The fact that both elements were undiscovered at the time

Question 10

What property did Mendeleev predict for Eka-silicon (later Germanium) regarding the formula of its oxide?

Accepted Answer

$	ext{EO}_2$

Answer

$	ext{E}_2	ext{O}_3$

Answer

$	ext{EO}$

Answer

$	ext{E}_2	ext{O}$

Question 11

What would be the IUPAC name and symbol for the element with atomic number $Z=120$?

Accepted Answer

Unbinilium ($	ext{Ubn}$)

Answer

Ununbium ($	ext{Uub}$)

Answer

Unnilennium ($	ext{Une}$)

Answer

Ununennium ($	ext{Uue}$)

Question 12

Using IUPAC nomenclature, the roots for the digits 1, 1, and 4 in the atomic number $Z=114$ are:

Accepted Answer

un, un, quad

Answer

un, un, nil

Answer

un, nil, un

Answer

un, bi, nil

Question 13

The element with the IUPAC temporary name Unnilhexium has the atomic number:

Accepted Answer

106

Answer

110

Answer

105

Answer

116

Question 14

What is the permanent official name for the element with the temporary IUPAC name Ununbium ($Z=112$)?

Accepted Answer

Copernicium ($	ext{Cn}$)

Answer

Flerovium ($	ext{Fl}$)

Answer

Nihonium ($	ext{Nh}$)

Answer

Darmstadtium ($	ext{Ds}$)

Question 15

Elements belonging to Group 1 and Group 2, having outermost electronic configurations $ns^1$ and $ns^2$ respectively, are collectively known as:

Accepted Answer

$s$-Block elements

Answer

$p$-Block elements

Answer

$d$-Block elements

Answer

$f$-Block elements

Question 16

What is the general outer electronic configuration for the $d$-block elements (Transition Elements)?

Accepted Answer

$(n-1)d^{1-10}ns^{0-2}$

Answer

$ns^{1-2}$

Answer

$ns^2np^{1-6}$

Answer

$(n-2)f^{1-14}(n-1)d^{0-1}ns^2$

Question 17

The elements characterized by the filling of $f$-orbitals and positioned separately at the bottom of the Periodic Table are the:

Accepted Answer

Inner-Transition Elements

Answer

Transition Elements

Answer

Representative Elements

Answer

Main Group Elements

Question 18

The elements of Groups 13 to 18, along with the $s$-block elements, are collectively referred to as the:

Accepted Answer

Representative Elements or Main Group Elements

Answer

Transition Elements

Answer

Inner-Transition Elements

Answer

Noble Gases

Question 19

An element has the electronic configuration $[	ext{Rn}]5f^{14}6d^{10}7s^27p^5$. To which family/group would this element ($Z=117$) belong?

Accepted Answer

Group 17 (Halogen family)

Answer

Group 1 (Alkali metals)

Answer

Group 18 (Noble gases)

Answer

Group 16 (Chalcogens)

Question 20

The principal quantum number ($n$) of the seventh period corresponds to the successive filling up of which set of orbitals?

Accepted Answer

$7s, 5f, 6d, 7p$

Answer

$7s, 6d, 7p$ only

Answer

$7s, 4f, 6d, 7p$

Answer

$7s, 7p$ only

Question 21

The lanthanoid series (4$f$-inner transition series) begins with Cerium ($Z=58$) and ends at:

Accepted Answer

Lutetium ($Z=71$)

Answer

Actinium ($Z=89$)

Answer

Thorium ($Z=90$)

Answer

Lawrencium ($Z=103$)

Question 22

The period number in the Periodic Table corresponds to which quantum number for the elements in that period?

Accepted Answer

Highest principal quantum number ($n$)

Answer

Azimuthal quantum number ($l$)

Answer

Magnetic quantum number ($m_l$)

Answer

Spin quantum number ($m_s$)

Question 23

The fourth period ($n=4$) contains 18 elements. This is due to the filling of which orbitals in sequential order?

Accepted Answer

$4s, 3d, 4p$

Answer

$4s, 4p$

Answer

$4s, 4d, 4p$

Answer

$4s, 3d, 4d, 4p$

Question 24

Based on the configuration $[	ext{Ar}]3d^14s^2$, the element Scandium ($Z=21$) is the first element of the:

Accepted Answer

$3d$ transition series

Answer

$4d$ transition series

Answer

$4f$ inner transition series

Answer

$5d$ transition series

Question 25

The positioning of Helium in the $p$-block along with Group 18 elements is justified because:

Accepted Answer

It has a completely filled valence shell ($1s^2$) characteristic of noble gases

Answer

It is the lightest element in the table.

Answer

It exhibits variable valence.

Answer

It is a poor conductor of heat and electricity.

Question 26

An element has the outer electronic configuration $	ext{3s}^2	ext{3p}^4$. Where is this element located in the Periodic Table?

Accepted Answer

Period 3, Group 16

Answer

Period 3, Group 14

Answer

Period 4, Group 16

Answer

Period 3, Group 2

Question 27

The element with the outer electronic configuration $(n-1)d^2ns^2$ for $n=4$ belongs to which block and group?

Accepted Answer

$d$-block, Group 4

Answer

$p$-block, Group 14

Answer

$s$-block, Group 2

Answer

$f$-block, Group 3

Question 28

Zinc ($	ext{Zn}, Z=30$), Cadmium ($	ext{Cd}$), and Mercury ($	ext{Hg}$) do not show most properties of transition elements. This is explained by their electronic configuration:

Accepted Answer

They have a completely filled inner $d^{10}$ shell and $s^2$ outermost shell

Answer

They are highly reactive metals.

Answer

They only form positive ions.

Answer

They belong to Group 13.

Question 29

The elements in the same vertical column (group) of the Periodic Table exhibit similar chemical behavior primarily because they have:

Accepted Answer

The same number and distribution of electrons in their outermost orbitals

Answer

The same number of valence orbitals ($n$)

Answer

Similar atomic masses

Answer

Identical nuclear charge

Question 30

The maximum theoretical number of elements in the sixth period ($n=6$) is 32. This is because the successive electrons enter which combination of orbitals?

Accepted Answer

$6s, 4f, 5d, 6p$

Answer

$6s, 6p$

Answer

$6s, 5d, 6p$

Answer

$6s, 4d, 5d, 6p$

Questions in this Quiz

More Quizzes for Class 11

Classification of Elements and Periodicity in Properties Set-1

Questions in this Quiz

More Quizzes for Class 11

Chemistry

JEE

Maths

Physics