Advertisements
Advertisements
प्रश्न
Define: Atomic number
Advertisements
उत्तर
Atomic number : Number of protons present in the nucleus of an atom.
APPEARS IN
संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
K2SO4
Write down the name of a compound represented by the following formula:
CaCl2
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
Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.
Define: Mass 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
Write the formulae of the following compounds. Also name the elements present in them.
- Water
- Ammonia
- Methane
- Sulphur dioxide
- Ethanol
In what form does oxygen gas occur in nature ?
What do the following denote ?
- N
- 2N
- N2
- 2N2
Calculate the mass of 3.011 × 1024 atoms of carbon.
Give one example of a triatomic molecule
Give a reason why –
Helium is considered monoatomic, but hydrogen a diatomic molecule.
State the atomicity of the following:
Oxygen
State the atomicity of the following:
Chlorine
State the atomicity of the following:
Argon
Which of the following is a short and scientific way of representing one molecule of an element or compound?
State true of false. If false, give the correct statement.
NaCl represents one molecule of sodium chloride.
Classify the following molecules as the molecules of element or compound
| 1. | ![]() |
|
| 2. | ![]() |
|
| 3. | ![]() |
|
| 4. | ![]() |
Give any two examples for heterodiatomic molecules.
Write any two classifications of a molecule.




