Mendeleev predicted the existence of certain elements not known at tha

1.	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?
Answer» 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-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?

Answer»

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.

(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?