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प्रश्न
Give the qualitative and quantitative meaning of the term ‘symbol’.
उत्तर
Qualitative meaning: C is the symbol of an atom of the element carbon
S is the symbol of the atom of element sulphur.
This means symbols stand for a specific element.
No two elements can have the same symbol.
Quantitative meaning: A symbol also represents the quantity of the element i.e. atomic mass of the element. Symbol C represents 12 g of carbon. In other words how many times that element is heavier than `1/12` th C12
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संबंधित प्रश्न
Explain the terms 'valency' and 'variable valency'.
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.
Hydrogen by ‘H’
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’
Match the formulas of the following of acids with their correct names:
Acids – (a) HCI (b) HNO3 (c) H2SO4 (d) H2CO3
Names – (1) Carbonic acid (2) Sulphuric acid (3) Hydrochloric acid (4) Nitric acid
Write the radical of the following valency:
Iodine
Give the formula of the following gas:
Nitrogen
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Hydroxide
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Aluminate
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Carbonate
The pictorial symbol for water given by the alchemists was
