(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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Mix Examples - Periodic Classification of Elements

The atomic number of an element is $17$. Predict $(a)$ its valency,$(b)$ whether it is a metal or non-metal,$(c)$ its relative size with respect to other members of its group. Justify your answer in each case.

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Which of the following sets of elements is written in the order of their increasing metallic character?

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Out of $Li$ and $K$,which will have stronger metallic character and why?

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Properties of the elements are given below. Where would you locate the following elements in the periodic table?
$(a)$ An element which is an inert gas with atomic number $2$.
$(b)$ An element whose thin oxide layer is used to make other elements corrosion resistant by the process of 'anodising'.

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Three elements $B$,$Si$ and $Ge$ are

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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

The atomic number of an element is $17$. Predict $(a)$ its valency,$(b)$ whether it is a metal or non-metal,$(c)$ its relative size with respect to other members of its group. Justify your answer in each case.

Which of the following sets of elements is written in the order of their increasing metallic character?

Out of $Li$ and $K$,which will have stronger metallic character and why?

Properties of the elements are given below. Where would you locate the following elements in the periodic table?$(a)$ An element which is an inert gas with atomic number $2$.$(b)$ An element whose thin oxide layer is used to make other elements corrosion resistant by the process of 'anodising'.

Three elements $B$,$Si$ and $Ge$ are

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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?

Properties of the elements are given below. Where would you locate the following elements in the periodic table?
$(a)$ An element which is an inert gas with atomic number $2$.
$(b)$ An element whose thin oxide layer is used to make other elements corrosion resistant by the process of 'anodising'.