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प्रश्न
How did Neils Bohr visualise the atom ?
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उत्तर
Niels Bohr explained that atom is like a solar system with an empty space with a minute central nucleus, like Sun and electrons life planets revolve around it.
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संबंधित प्रश्न
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
WRITE SHORT ANSWER
Define an ionic compound.
Fill in the blank
An ion with positive charge is called ______
Define: Mass number
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
Who originated the word ‘atom’ ?
State Dalton’s atomic theory.
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
Which of the following statement is correct about the atom of an element ?
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
What will be the charge present of the molecule XY after chemical combination?
Select the correct answer to the statement given below:
The basic unit of matter is not capable of independent existence.
K: Potassium:: C: ______.
In the nucleus of `""_20"Ca"^40`, there are ______
Atoms of different elements having the same number of ______ are called isotones.
Which of the following has maximum number of atoms?
Does the solubility of a substance change with temperature? Explain with the help of an example.
The most abundant type of atom is the universe is ______.
