Classification of Elements and Periodicity in Properties

In this quiz, you will find questions related to the position of different elements in the periodic table, their properties, and various periodic laws.

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__________ gave the idea for the first time to classify elements as per their properties.

Mendeleev Dobereiner Newland John

In triads, the average weight of the 1st and the 3rd element are equal to the second one.

True False

Which of the following is not Dobereiner triad?

Li, Na, and K He, Na and Ar Ca, Sr and Ba CL, Br and I

The property of every eight elements is similar to that of the 1st element. This is proposed by ___________

Thomson Dobereiner Mendeleev John Alexander Newland

The periodic functions of the __________ are the properties of respective elements.

Atomic Weights Atomic Number Chemical properties No of protons

Find the successive elements of the periodic table with ionisation energies, 2372, 520 and 890 kJ per mol respectively

Li, Be, B H, He, Li B, C, N He, Li, Be

The correct order for the size of I, I+, I– is

I > I– > I+ I > I+ > I– I– > I > I+ I+ > I– > I

For the same value of n, the penetration power of orbital follows the order

s = p = d = f p > s > d > f f < d < p < s s < p < d < f

Which of the reactions will need the maximum amount of energy?

Na → Na+ + e– Ca+ → Ca++ + e– K+ → K+ ++ e– C2+ → C3+ + e–

The element with atomic number 35 belongs to

d – Block f – Block p – Block s – Block

The correct order of first ionization potential among following elements, Be, B, C, N and O is

B < Be < C < O < N B < Be < C < N < O Be < B < C < N < O Be < B < C < O < N

Representative elements are those which belong to

p and d – Block s and d – Block s and p – Block s and f – Block

Which of the following properties generally decreases along a period?

Ionization Energy Metallic Character Electron Affinity Valency.

The group number, number of valence electrons, and valency of an element with the atomic number 15, respectively, are:

16, 5 and 2 15, 5 and 3 16, 6 and 3 15, 6 and 2

In the modern periodic table, the number of period of the element is the same as

Principal quantum number

Atomic number

Azimuthal quantum number

Atomic mass

Cl, Br, I, if this is Dobereiner’s triad and the atomic masses of Cl and I are 35.5 and 127 respectively the atomic mass of Br is

81.25

162.5

91.5

45.625

If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is

Arsenic

Iodine

Sulphur

Calcium

The law of triads is applicable to a group of

Cl, Br, I

Na, K, Rb

C, N, O

H, O, N

In 1800, only _____X _____ elements were known. Here, X refers to

None of these

Johann Doberiner gave the idea of trends among physical and ...X... of several groups of three elements. Here, X refers to

Chemical properties

Atomic number

Atomic mass

None of these

Quiz/Test Summary

Title: Classification of Elements and Periodicity in Properties

Questions: 20

Contributed by:

james Sat, Feb 12, 2022 05:44 PM UTC

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