How are elements arranged in the Modern Periodic Table ?
State the position of (i) Metals (ii) Non–metals (iii) Noble gases and (iv) Metalloids in the
Modern Periodic Table.

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Solution

The basic property of arrangement of elements in modern periodic table is atomic number, and the elements are arranged according to the increasing atomic numbers in 18 groups and 7 periods.
Metals have been arranged in left hand side while nonmetals are arranged in right hand side and the metalloids are in the border line of both the metals and non-metals in a zig-zag manner.
The noble gases are arranged in extreme right of the table in 18th group.

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Answer the following:

1. How could the modern periodic table remove various anomalies of Mendeleev’s periodic table?

2. In the modern periodic table, which are the metals, non-metals and metalloids among the first twenty elements?

3. What are the demerits of Mendeleev’s periodic table?

4. Define atomic size. How does it vary in a period and in a group?

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?

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