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प्रश्न
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
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उत्तर
- Electron
- Electrons are present outside the nucleus of an atom.
- Electrons are negatively charged that is (−1.6 × 10-19 coulomb).
- The mass of an electron is considered to be negligible. It is 1800 times less than that of a hydrogen
- The mass of an electron is 1800 times less than that of a hydrogen atom
- It revolves around the nucleus in the discrete orbit.
- Proton:
- Protons are present inside the nucleus of an atom.
- Protons are positively charged that is (1e = 1.6 × 10−19 coulomb).
- The mass of a proton is approximately 1 u (1 Dalton); that is, 1 u = 1.66 × 10−27 kg).
- When the total positive charge on the nucleus is expressed in the unit ‘e’, its magnitude is equal to the number of protons in the nucleus. The mass of one proton is approximately 1 u (1 Dalton).
- Neutron:
- Neutrons are present inside the nucleus of an atom.
- Neutrons are neutral. There is no charge.
- The mass of a neutron is nearly equal to the mass of a proton that is 1 u(1 Dalton) that is (1 u = 1.66 × 10−27 kg).
- The mass of a neutron is approximately lu, which is almost equal to that of a proton.
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 |
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
Name the particles which revolve around the nucleus.
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Fill in the blank
A charged particle is called an _____
Name the unit in which the radius of an atom is usually expressed.
Write the relation between nanometre and metre.
How many times is a proton heavier than an electron?
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)
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
The electron shell ______ is nearest to the nucleus.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form negative ion?
The volume occupied by 4.4 g of CO2 at S.T.P ______
Atoms of different elements having the same number of ______ are called isotones.
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?
What is the fundamental particle of an element?
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 ______.
Statement I: Atoms are electrically neutral as they contain equal number of positive and negative charges.
Statement II: Atoms of each element are stable and emit their characteristic spectrum.
In the light of the above statements, choose the most appropriate answer from the options given below:
