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प्रश्न
Define: Mass number :
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उत्तर
Mass number : Numbr of protons and neutrons present in the nucleus of an atom.
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संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
Al2(SO4)3
Write down the name of a compound represented by the following formula:
KNO3
Write down the name of a compound represented by the following formula:
CaCO3
Give the name of the element present in the following compound:
Quick lime
Give the name of the element present in the following compound:
Hydrogen bromide
Give the name of the element present in the following compound:
Baking powder
Define: Atomic number
Define: Atomic weight :
What is meant by atomicity ? Explain with two examples.
What is the atomicity of the following ?
- Oxygen
- Ozone
- Neon
- Sulphur
- Phosphorus
- Sodium
In what form does oxygen gas occur in nature ?
In what form do noble gases occur in nature?
What do the following denote ?
- N
- 2N
- N2
- 2N2
What are (i) ionic compounds, and (ii) molecular compounds ? Give two examples of each type of compounds.
Molecular compounds are usually formed by the combination between :
An element A forms an oxide A2O5.
What is the valency of element A ?
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Why are the symbols and formulae of substances important?
State the main points of the contradiction of Dalton’s atomic theory by the Modern Atomic Theory.
Give a reason why –
Helium is considered monoatomic, but hydrogen a diatomic molecule.
Give a reason why –
Ozone is considered triatomic, but phosphorus a tetratomic molecule.
State the atomicity of the following:
Neon
State the atomicity of the following:
Sulphur
If a molecule is made of similar kinds of atoms, then it is called ______ atomic molecule.
Two elements sometimes can form more than one compound.
Give any two examples for heterodiatomic molecules.
Write any two classifications of a molecule.
