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NCERT Class X Science Class: Chapter β 5. Periodic Classification of Elements β Part-10
Question 46:
- In this ladder (Figure) symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the Periodic Table.
- Arrange them in the order of their group also.
Answer:
(a)
The symbols of elements arranged in increasing order of their atomic numbers are as shown below:
(b)
The symbols of elements arranged in increasing order of their group numbers are as follows:
Question 47:
Mendeleev predicted the existence of certain elements not known at that time and named two of them as .
- Name the elements which have taken the place of these elements
- Mention the group and the period of these elements in the Modern Periodic Table.
- Classify these elements as metals, non-metals or metalloids
- How many valence electrons are present in each one of them?
Answer:
- Germanium () and Gallium ()
- Group 14; Period 4 and Group 13; Period 4
- Ge β Metalloid; Ga β Metal
- Ga β 3 Ge β 4
Question 48:
- Electropositive nature of the element (s) increases down the group and decreases across the period
- Electronegativity of the element decreases down the group and increases across the period
- Atomic size increases down the group and decreases across a period (left to right)
- Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.
- Name the most electropositive element among them
- Name the most electronegative element
- Name the element with smallest atomic size
- Name the element which is a metalloid
- Name the element which shows maximum valency.
Answer:
- Lithium
- Fluorine
- Fluorine
- Boron
- Carbon