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प्रश्न
Name the unit in which the radius of an atom is usually expressed.
उत्तर
The radius of an atom is usually expressed in nanometre (nm).
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संबंधित प्रश्न
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Define:- Radicals
What are orbits or shells ?
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Name three non-metals/radicals which have valency -1, -2, and -3.
How did Neils Bohr visualise the atom ?
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
Fill in the blank
A charged particle is called an _____
Why is it not possible to see an atom even with the most powerful microscope ?
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Draw diagrams representing the atomic structures of the following:
- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
Select the correct answer to the statement given below:
The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.
Draw the structure of an atom and explain the position of the sub-atomic particles.
Define the following term with an example.
Non-metal
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
Lead is also known as plumbum.
The ______ are combination of atoms of various elements or the same element.
The first scientific theory about atoms was given by J J. Thomson.
