In a long form periodic table, the elements in a period are arranged according to the ____.

Correct! Wrong!

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In a long form periodic table, the elements in a period are arranged according to strict sequence of increase in atomic number.

According to modern periodic law, the physical and chemical properties of elements are periodic functions of their _____.

Correct! Wrong!

According to modern periodic law, the physical and chemical properties of elements are periodic functions of their atomic number.

Magnesium belongs to the ____ group.

Correct! Wrong!

Magnesium belongs to the llA group.

In the periodic table rubidium and radium are present in groups ____ respectively.

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In the periodic table rubidium and radium are present in groups 1 and 2 respectively.

Actinide series starts with ____.

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Actinide series starts with thorium (Z=90) and ends with lawrencium (Z=103).

Mendeleev’s periodic table is based on atomic ____.

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Mendeleev's periodic table is based on atomic mass.

A triad is a group of ____.

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Triad is a group of three elements. Triads were given by Dobereiner.

Which of the following is a metalloid?

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Si is a metalloid since, it shows the properties of both metals and non-metals.

The ‘Law of triads’ was proposed by ____.

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The ‘Law of triads’ was proposed by Dobereiner.

____ belongs to the 2nd group of the periodic table.

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Be belongs to the 2nd group of the periodic table.

Eka-boron is ____.

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Mendeleev named scandium as eka-boron, as it was not discovered at that time.

____ elements were known when Mendeleev presented the periodic table.

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63 elements were known when Mendeleev presented the periodic table.

Which of the following set of elements showed reversal of atomic weights in Mendeleev’s periodic table?

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Iodine and tellurium showed reversal of atomic weights in Mendeleev’s periodic table.

____ elements are known so far.

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118 elements are known so far.

Which elements were not given proper place in Mendeleev’s periodic table?

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Lanthanides were not given proper place in Mendeleev’s periodic table.

Cu, Ag and Au are called coinage metals because they ____.

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Cu, Ag and Au are called coinage metals because they were earlier used in minting coins.

The period that contains only gaseous elements is the ____ period.

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The first period contains only hydrogen and helium, which are in a gaseous state.

Which was the first classification of elements?

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Earlier when only very few elements were discovered, they were classified very broadly into metals and non-metals.

Mendeleev's periodic table has ____ periods and ____ groups.

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Mendeleev's periodic table has 12 periods and 8 groups.

Which of the following element was not predicted by Mendeleev?

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Eka-nitrogen was not predicted by Mendeleev. Eka-nitrogen does not exist. Mendeleev was able to predict the properties of unknown elements and left three blanks for those elements. He named them eka-boron, eka-aluminium and eka-silicon.

Chemically inactive elements are placed in the ____ group.

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Chemically inactive elements are placed in the eighth group.

Atomic numbers were discovered by ____.

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Atomic numbers were discovered by Moseley.

The first periodic table was given by ____.

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The first periodic table was given by Mendeleev.

Ca, Sr and Ba are alkali metals.

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Ca, Sr and Ba are alkaline earth metals. Their oxides are alkaline in nature and exist in the earth's crust.

The elements in a group have ____.

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The elements in a group have a similar electronic configuration, therefore, they possess the same chemical properties.

There are ____ elements in the third period of the periodic table.

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There are 8 elements in the third period of the periodic table.

Each period in the periodic table ends with ____.

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In the periodic table, each period starts with an alkali metal and ends with an inert gas element.

The vertical columns in which elements are arranged in Mendeleev’s table are called ____.

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The vertical columns in which elements are arranged in Mendeleev's table are called groups.

____ considered atomic volume for the classification of elements.

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Lother Meyer considered atomic volume for the classification of elements.

Which of the following were not included in Mendeleev’s periodic table?

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Isotopes were not included in Mendeleev’s periodic table.

ICSE Class 9th Chemistry - Periodic Table MCQs
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