Advertisements
Advertisements
प्रश्न
Define: Atomic number
Advertisements
उत्तर
Atomic number— Atomic number refers to the number of protons present in an atom. It is denoted by Z.
APPEARS IN
संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
Al2(SO4)3
Give the name of the element present in the following compound:
Baking powder
Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.
State the term.
The number of atoms present in a molecule of an element _________
Define: Mass number :
Define: Atomic weight :
In what form do noble gases occur in nature?
What do the following denote ?
- N
- 2N
- N2
- 2N2
Work out the formula for magnesium hydrogencarbonate.
What are (i) ionic compounds, and (ii) molecular compounds ? Give two examples of each type of compounds.
The cation of an element has :
An element X forms the following compounds with hydrogen, carbon and oxygen :
H2X, CX2, XO2, XO3
State the three valencies of element X which are illustrated by these compounds.
Correct the following statement:
A molecule of sulphur is monoatomic.
Explain the term – molecules. Give three examples of atoms of the same element forming a molecule. State the atomicity of the same.
Give a reason why –
Ozone is considered triatomic, but phosphorus a tetratomic molecule.
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.
Which of the following is a triatomic molecule?
If a molecule is made of similar kinds of atoms, then it is called ______ atomic molecule.
The Atomicity of phosphorous is ______
Derive the relationship between Relative molecular mass and Vapour density.
Write any two classifications of a molecule.
