(A) Mendeleev's Eka-silicon is known as Germanium $(Ge)$,which is a metalloid. Eka-aluminium is known as Gallium $(Ga)$,which is a metal.$(b)$ Gallium

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Eka-silicon: Metalloid,Eka-aluminium: Metal

(A) Mendeleev's Eka-silicon is known as Germanium $(Ge)$,which is a metalloid. Eka-aluminium is known as Gallium $(Ga)$,which is a metal.$(b)$ Gallium $(Ga)$ belongs to Group $13$ of the periodic table,so it has $3$ valence electrons. Germanium $(Ge)$ belongs to Group $14$ of the periodic table,so it has $4$ valence electrons.

Class 10 Science Periodic Classification of Elements Mix Examples - Periodic Classification of Elements

Medium

Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
$(a)$ Classify these elements as metals,non-metals,or metalloids.
$(b)$ How many valence electrons are present in each one of them?

A
Eka-silicon: Metalloid,Eka-aluminium: Metal
B
Eka-silicon: $4$,Eka-aluminium: $3$
C
Eka-silicon: Metal,Eka-aluminium: Metalloid
D
Eka-silicon: Non-metal,Eka-aluminium: Metal

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Periodic Classification of Elements

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Mix Examples - Periodic Classification of Elements

Arrange the following elements in the order of their decreasing metallic character:
$Na, Si, Cl, Mg, Al$

Medium

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$(i)$ State Modern Periodic Law.
$(ii)$ How many :
$(a)$ groups and
$(b)$ periods are present in the modern periodic table?
$(iii)$ State how the problem of placing:
$(a)$ hydrogen,
$(b)$ isotopes of an element has been solved in this periodic table.

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Up to which element was the Law of Octaves found to be applicable?

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Which of the following statements is not correct regarding the trends observed when moving from left to right across the periods of the Periodic Table?

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The electrons in the atoms of four elements $A, B, C$ and $D$ are distributed in three shells having $1, 3, 5$ and $7$ electrons in the outermost shell respectively. State the period in which these elements can be placed in the modern periodic table. Write the electronic configuration of the atoms of $A$ and $D$ and the molecular formula of the compound formed when $A$ and $D$ combine.

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Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.$(a)$ Classify these elements as metals,non-metals,or metalloids.$(b)$ How many valence electrons are present in each one of them?

Similar Questions

Arrange the following elements in the order of their decreasing metallic character:$Na, Si, Cl, Mg, Al$

$(i)$ State Modern Periodic Law.$(ii)$ How many :$(a)$ groups and$(b)$ periods are present in the modern periodic table?$(iii)$ State how the problem of placing:$(a)$ hydrogen,$(b)$ isotopes of an element has been solved in this periodic table.

Up to which element was the Law of Octaves found to be applicable?

Which of the following statements is not correct regarding the trends observed when moving from left to right across the periods of the Periodic Table?

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Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
$(a)$ Classify these elements as metals,non-metals,or metalloids.
$(b)$ How many valence electrons are present in each one of them?

Arrange the following elements in the order of their decreasing metallic character:
$Na, Si, Cl, Mg, Al$

$(i)$ State Modern Periodic Law.
$(ii)$ How many :
$(a)$ groups and
$(b)$ periods are present in the modern periodic table?
$(iii)$ State how the problem of placing:
$(a)$ hydrogen,
$(b)$ isotopes of an element has been solved in this periodic table.