EASY

Earn 100

Who proposed the law of octaves?

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Important Questions on The Periodic Table

MEDIUM

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

Classification of elements helps us to

EASY

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

What were the criteria used by Mendeleev in creating his Periodic Table?

HARD

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

In Mendeleev's periodic table, gaps were left for the elements to be discovered later on. An element which found a vacant place in the periodic table later on is

MEDIUM

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

Write a short note on the position of isotopes in the Mendeleev’s and the modern periodic table.

MEDIUM

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

What were the limitations of Dobereiner’s classification?

HARD

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

An element

X

forms an oxide

X_{2} O_{3}

. In which group of Mendeleev's periodic table is this element placed?

EASY

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

Hydrogen is regarded as a rogue element in the periodic table. Elaborate.

HARD

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

In Mendeleev's periodic table, gap was not left for one of the following elements. This element is:

EASY

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

Name two other elements which belong to the fluorine family.

MEDIUM

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.

EASY

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

In the classification of then known elements, Mendeleev was guided by two factors. What were the two factors?

EASY

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (any two)

MEDIUM

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

What were the limitations of Newlands’ Law of Octaves?

MEDIUM

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

Mendeleev predicted the existence of two elements and named them as Eka-Silicon and Eka-Boron.
(a) Name the elements which took over their positions.
(b) Name the groups to which these elements belong and also give their electronic configuration.
(c) Predict the valencies of these elements.

MEDIUM

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

The three imaginary elements X, Y and Z represent a Dobereiner's triad. If the atomic mass of the element X is 14 and that of element Y is 46, then the atomic mass of element Z will be:

MEDIUM

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

Write a short note on Mendeleev’s periodic law.

MEDIUM

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

Compare and contrast the arrangement of elements in Mendeleev's Periodic Table and the Modern Periodic Table.

EASY

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

Three elements A, B and C have the atomic numbers 2, 12 and 20. Which of these belong same group?

HARD

Science>Chemistry>The Periodic Table>Early Attempts at Classification of Elements

Rearrange the columns $2$ and $3$ to match with the column $1$ .