Advertisements
Advertisements
Question
Define: Mass number :
Solution
Mass number : Numbr of protons and neutrons present in the nucleus of an atom.
APPEARS IN
RELATED QUESTIONS
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:
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
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: Atomic number
Define: Atomic weight :
What is meant by atomicity ? Explain with two examples.
In what form does oxygen gas occur in nature ?
The cation of an element has :
An element A forms an oxide A2O5.
What is the valency of element A ?
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.
Calculate the mass of 3.011 × 1024 atoms of carbon.
Correct the following statement:
A molecule of sulphur is monoatomic.
Give one example of a polyatomic molecule.
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.
State the atomicity of the following:
Oxygen
State the atomicity of the following:
Argon
State the atomicity of the following:
Sulphur
Classify the following molecules as the molecules of element or compound
| 1. |  |
|
| 2. |  |
|
| 3. |  |
|
| 4. |  |
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.
