why are metals placed to the left, non metals to the right and metalloids in the center of the modern periodic table?

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Solution

The periodic table was arranged according to the increasing atomic number. The properties of the elements repeat them after a interval of 7 elements. The first element of each period that has a tendency to lose electrons. As a result the elements having same properties ended up being on one side of the table. Metals on the left, non metals on the extreme right and metalloids in between.

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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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