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प्रश्न
An atom of an element is denoted by a “symbol” Explain the meaning of the term ‘symbol’. State a reason for representing the following element by its symbol.
Helium by ‘He’
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उत्तर
Symbols: The short form or abbreviated name of the element (or radicals) The reason for representing the following element by their symbol is as follow:
Helium by He – First two letters of the name of Noble gases.
संबंधित प्रश्न
The atoms of which of the following pair of elements are most likely to exist in free state ?
The atomic number of an element X is 13. What will be the number of electrons in its ion X3+ ?
Fill in the blank:
Symbol represents _____ atom(s) of an element.
Match the symbols of – radicals – with their correct combining power or capacity, (valency).
(a) OH
(b) So4
(c) No3
(d) Co3
Combining power or capacity – A : 3; B : 2; C : 1. (negative valencies)
State the type of element for the following:
Bromine
Write the radical of the following valency:
Phosphate
Write the chemical formula of the following:
calcium carbonate
State the valency of the following metallic element and write symbol with the valency
Magnesium
Complete the statement given below by filling in the blanks with the correct words.
From the elements – He, Br, Pt and O; the element which forms a polyatomic molecule is ________ and which is liquid at room temperature is ________.
Write the symbols for the following elements and classify them as solid, liquid and gas. Aluminum, Carbon, Chlorine, Mercury, Hydrogen and Helium
