The elements of group IA have ____.

Correct! Wrong!

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The elements of group IA have 1 valence electron.

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

Correct! Wrong!

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

Ca, Sr and Ba are alkali metals.

Correct! Wrong!

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

The chemical reactivity of an element can be best shown by its reactions with ____ and _______.

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The chemical reactivity of an element can be best shown by its reactions with oxygen and halogens.

____ elements are known so far.

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118 elements are known so far.

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.

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 most non-metallic group among the following is ____.

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The most non-metallic group among the following is VIIA. VIIA group elements are halogens and all elements in this group are non-metallic.

Metalloids combine with oxygen to form ____ oxides.

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Metalloids combine with oxygen to form amphoteric oxides.

Law of Triads was referred to as ____ relationship.

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

Which of the following property of alkali metals increases with the increase in atomic number?

Correct! Wrong!

In alkali metals with the increase in atomic number, the atomic size of the atom increases. This is due to the increase in the number of shells and the decrease in nuclear charge.

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.

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.

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 ____.

Correct! Wrong!

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

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

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

Magnesium belongs to the ____ group.

Correct! Wrong!

Magnesium belongs to the llA group.

All chemical and physical properties are a manifestation of the ____ of elements.

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All chemical and physical properties are a manifestation of the electronic configuration of elements.

In periodic table, the metallic character decreases along a period.

Correct! Wrong!

In a period, the metallic character decreases from along a period and the non-metallic character increases.

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 number of elements known at present is ____.

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The number of elements known at present is 114.

The metallic character of the elements ____ down the group.

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The metallic character of the elements increases down the group.

The old periodic law states that the properties of the elements are a periodic function of their ____.

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The periodic law states that the properties of the elements are a periodic function of their atomic weights.Mendeleev was responsible for publishing the Periodic Law for the first time.

Elements in the same period have similar chemical properties.

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Elements in the same period have different chemical properties, while elements in a group have similar chemical properties.

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

Correct! Wrong!

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

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.

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.

The periodic law owes its development to the Russian chemist ____ and the German chemist ____.

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The periodic law owes its development to the Russian chemist Dmitri Mendeleev and the German chemist Lothar Meyer.

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

Correct! Wrong!

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

The electron affinity across the period increases from left to right.

Correct! Wrong!

Electron affinity is the tendency of an atom to accept electrons. As we move from left to right in the periodic table the nuclear charge increase and the atomic radius decreases. Such a condition favors the tendency of acceptance of electrons, hence, electron affinity increases.

French geologist A.E.B.de Chancourtois arranged the then known elements in order of ____ and made a ____ table of elements to display the periodic recurrence of properties.

Correct! Wrong!

French geologist A.E.B.de Chancourtois arranged the then known elements in order of increasing atomic weights, and made a cylindrical table of elements to display the periodic recurrence of properties.This classification did not attract much attention.

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