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प्रश्न
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
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उत्तर
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संबंधित प्रश्न
WRITE SHORT ANSWER
Name three inert gases.
Define:- Molecule
Write the names of the elements present in the:-
Acetic acid
Define: Covalent bond
Name the particle or particles you would expect to find in :
The orbit of an atom
Name the three subatomic particles present in an atom.
How many times is a proton heavier than an electron?
What value has been given to the mass of this reference atom ?
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.
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
In what respects do the three isotopes of hydrogen differ? Give their structures.
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
A radical take part – unsplit in a chemical reaction and retains its identity in reactions.
With reference to the radical –
- ammonium
- bisulphate
- carbonate
state the group of atoms present in each radical.
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.
Name the sub-atomic particles.
A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?
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 graphite refill used is pencil is made of element called ______.
A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let Sn be the distance travelled by the block in the interval t = n – 1 to t = n. Then, the ratio `S_n/(S_(n + 1))` is ______.
