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प्रश्न
Define: Ions
उत्तर
An atom which becomes charged by losing or gaining electrons is called an ion.
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संबंधित प्रश्न
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
WRITE SHORT ANSWER
What is radioactivity?
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
ANSWER IN DETAIL
How are isobars different from isotopes ?
Define:- Molecule
Write the names of the elements present in the:-
Ammonia
Write the names of `"Na"_3"PO"_4` compounds :
Fill in the blank
An excess of electrons produces a ________ charge.
Fill in the blank
A deficiency of electrons produces a ________ charge.
What are the building blocks of matter ?
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
State two observations which show that atom is not indivisible.
Which has more atoms, 50 g of aluminium or 50 g of iron ? Illustrate your answer with the help of calculations.
(Atomic masses : Al = 27 u ; Fe = 25 u)
What is the contribution of the following in atomic structure?
Maharshi Kanada
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 basic unit of matter is ______.
Which of the following statements made by Dalton has not undergone any change?
The first scientific theory about atoms was given by J J. Thomson.
