Carbon belongs to the 2nd period of group 14. Silicon belongs to the 3rd period of group14. If the atomic number of carbon is 6, the atomic number of silicon is ____.

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

The reverse trend of the metallic character for the transition elements can be explained in terms of ____ and ____.

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The reverse trend of the metallic character for the transition elements can be explained in terms of atomic size and ionization enthalpy.

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.

Metalloids combine with oxygen to form ____ oxides.

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Metalloids combine with oxygen to form amphoteric oxides.

____ elements are known so far.

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118 elements are known so far.

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.

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.

The number of elements known at present is ____.

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The number of elements known at present is 114.

In a group, the metallic character of elements ____ as we move from top to bottom.

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In a group, the metallic character of elements increases from top to bottom. This is due to the gradual increase in atomic size.

Law of Triads was referred to as ____ relationship.

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Law of Triads was referred to as Dobereiner's relationship.

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.

The metallic character of the elements ____ down the group.