Periodic Classification of Elements

Carbon belongs to the 2nd period of group 14. Silicon belongs to the 3rd period of group 14. If the atomic number of carbon is 6, the atomic number of silicon is ____.

Correct! Wrong!

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Silicon is the 8th element after carbon. Therefore, the atomic number of silicon is 6 + 8 = 14.

Atomic numbers were discovered by ____.

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Atomic numbers were discovered by Moseley.

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.

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.

Metalloids combine with oxygen to form ____ oxides.

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Metalloids combine with oxygen to form amphoteric oxides.

Which of the following periods contain solid, liquid and gaseous elements?

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The fourth period contains solid, liquid and gaseous elements.

The atomic size of the elements of group I ____ as we move down the group.

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The atomic size of the elements of group I increases as we move down the group.

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.

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

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

____ elements are known so far.

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118 elements are known so far.

____ elements were known when Mendeleev presented the periodic table.

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63 elements were known when Mendeleev presented the periodic table.

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.

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.

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.

Magnesium belongs to the ____ group.

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Magnesium belongs to the llA group.

The first and the last element in the largest period of the modern periodic table are ____.

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Cs is the first element and Rn is the last element of the largest period (sixth period) in the modern periodic table.

The first periodic table was given by ____.

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The first periodic table was given by Mendeleev.

The ‘Law of triads’ was proposed by ____.

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The ‘Law of triads’ was proposed by Dobereiner.

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.

Actinide series starts with ____.

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

A triad is a group of ____.

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

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

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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.

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.

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

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Be belongs to the 2nd group 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 elements of group IA have ____.

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The elements of group IA have 1 valence electron.

____ considered atomic volume for the classification of elements.

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Lothar Meyer considered atomic volume for the classification of elements.

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.

Mendeleev’s periodic table is based on atomic ____.

Correct! Wrong!

Mendeleev's periodic table is based on atomic mass.

CBSE Class 10th Science 5 - Periodic Classification of Elements MCQs
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