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प्रश्न
Write the names of the elements present in the following compound.
Common salt
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उत्तर
Sodium chloride
APPEARS IN
संबंधित प्रश्न
MATCH THE COLUMNAS
| 1. Jpham Dalton | a. Neutrons |
| 2. Atom | b. Model of the atom |
| 3. Chadwick | c.The atomic theory of matter |
| 4. Rutherfrod | d. Positively charged |
| 5. Protons | e. Electricity neutral |
| 6. Nuclear fusion | f. Generator of electricity |
| 7.Gamma -rays | g. High penetrating power |
| h.Energy in sun |
WRITE SHORT ANSWER
What is radioactivity?
Write the names of `("NH"_4)_2"SO"_4` compounds:
Write the names of `"FeS"` compounds :
Define: Mass number
What are orbits or shells ?
Who originated the word ‘atom’ ?
What does the word ‘atom’ mean?
Name the particle or particles you would expect to find in :
The nucleus of an atom
Define: An 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 ?
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
In what respects do the three isotopes of hydrogen differ? Give their structures.
In all atoms of an element
The number of atoms present in a molecule is called its ______.
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportions
The first scientific theory about atoms was given by J J. Thomson.
