A symbols written in the periodic table represents different ________ in periodic table.

atom

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element

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formula

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none of these

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Solution

The correct option is B element
In periodic table each element is given a symbol by which they are identified.
Example: Oxygen element is given symbol as $O$ ; Fluorine element is given symbol as $F$ .
Atoms are made up of protons, neutrons and electrons and elements are made up of those atoms.
Hence, element and not atoms are represented by symbol.

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(a) In this ladder (Figure 5.2) symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the Periodic Table.

(b) Arrange them in the order of their group also.

Question 46
(a) In this ladder (Figure 5.2) symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the Periodic Table.

(b) Arrange them in the order of their group also.

Q. (a) Explain why:
(i) All the elements of a group have similar chemical properties.
(ii) All the elements of a period have different chemical properties.

(b) The atomic radii of three elements X, Y and Z of a period of the periodic table are 186 pm; 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.

Q. In this ladder, symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the periodic table.

Q. How does number of (i) valence electrons (ii) valency; vary on moving from to right:
(a) in the second period of a periodic table ?
(b) in the third period of a periodic table ?

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