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प्रश्न
Which of the following symbols of elements are incorrect? Give their correct symbols
- Cobalt CO
- Carbon c
- Aluminium AL
- Helium He
- Sodium So
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उत्तर
- Cobalt – Co
- Carbon – c
- Aluminium – A1
- Helium – He (correct)
- Sodium – Na
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संबंधित प्रश्न
What do you understand by :
Noble gases
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.
Copper by ‘Cu’
State what a chemical formula denotes.
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)
Give the symbol of the following element:
Lead
State the type of element for the following:
Oxygen
State the type of element for the following:
Mercury
State the most reactive and the least reactive metal from the following – Zn, Ag, Na, Fe, Cu, Pb.
Give the symbol of the following element:
Carbonate
Write the radical of the following valency:
Zinc
