Question 47(c)
Mendeleev ′ predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
Classify these elements as metals, non-metals or metalloids

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Solution

Eka-silicon (Ge) is known as germanium and is a metalloid.
Eka-aluminium (Ga) is known as gallium and is a metal.

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Q. Mendeleev ′ predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
Classify these elements as metals, non-metals or metalloids

Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium?

(a) Name the elements which have taken the place of these elements.

(b) Mention the group and the period of these elements in the Modern Periodic Table.

Q. Question 47(a)
Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-Silicon and Eka-Aluminium.

Name the elements which have taken the place of these elements.

Q. Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.

(a) Name the element which has taken the place of (i) eka-aluminium, and (ii) eka-silicon
(b) Mention the period/periods of these elements in the modern periodic table.
(c) Write the group/ groups of these elements in the modern periodic table.
(d) Classify these elements as metals, non-metals or metalloids.
(e) How many valence electrons are present in the atoms of each of these elements?

Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
How many valence electrons are present in each one of them?

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Classification of Modern Periodic Table

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Question 47(c) Mendeleev ′ predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. Classify these elements as metals, non-metals or metalloids

Eka-silicon (Ge) is known as germanium and is a metalloid. Eka-aluminium (Ga) is known as gallium and is a metal.

Question 47(c)
Mendeleev ′ predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
Classify these elements as metals, non-metals or metalloids

Eka-silicon (Ge) is known as germanium and is a metalloid.
Eka-aluminium (Ga) is known as gallium and is a metal.