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प्रश्न
Write the names of `"FeS"` compounds :
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उत्तर
`"FeS"` - Iron sulphide
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ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Write the names of the elements present in the following compound.
Common salt
Define: Ions
Name three non-metals/radicals which have valency -1, -2, and -3.
How did Neils Bohr visualise the atom ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
Fill in the blank
If an atom gains an electron, it is called an _______
Fill in the blank
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One nm is equal to :
An atom of an element X may be written as `""_9^4"X"`
(a) What does the figure 9 indicate?
(b) What does the figure 4 indicate?
(c) What is the number of protons in atom X?
(d) What is the number of neutrons in atom X?
(e) What is the number of electrons in atom X?
(f) How many electrons are there in the outermost shell of an atom of element X?
(g) Write the symbol of ion formed by an atom of element X.
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
Define the following term with an example.
Element
Name the sub-atomic particles.
In all atoms of an element
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
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
