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प्रश्न
Who originated the word ‘atom’ ?
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उत्तर
Democritus
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संबंधित प्रश्न
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
What are orbits or shells ?
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
Fill in the blank
A charged particle is called an _____
What value has been given to the mass of this reference atom ?
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
What is an atom ? How do atoms usually exist ?
Find the mass of 2 moles of nitrogen atoms.
In what respects do the three isotopes of hydrogen differ? Give their structures.
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
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.
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium
Define the following term with an example.
Element
The basic unit of matter is ______.
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
K: Potassium:: C: ______.
The most abundant type of atom is the universe is ______.
