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प्रश्न
Define: Compounds
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उत्तर
Compounds : A compound is a pure substance formed by the chemical combination of two or more elements in a fixed ratio by mass.
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संबंधित प्रश्न
Write the names of following elements Na, C, Kr, U, Ra, Fe, Co.
The scientist who proposed the first letter (or first letter and another letter) of the Latin or English name of
an element as its symbol, was :
Out of ozone, phosphorus, sulphur and krypton, the elements having the lowest and highest atomicities are respectively :
Write the formula of the compound formed – given symbols and combining power or capacity (valency) of the following element in the compound.
Ca2+ NO31-
State what is meant by the term ‘activity series of metals’.
Give three reasons why – carbon dioxide is considered a compound, while carbon – an element.
Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Mercury
write symbol with the variable valency
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).
Sulphide
Symbol of mercury is
What is the significance of the symbol of an element?
