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प्रश्न
Mention briefly the salient features of Dalton’s atomic theory (five points)
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उत्तर
Salient features of Dalton’s atomic theory:
- Matter consists of very small and indivisible particles called atoms, which can neither be created nor can be destroyed.
- The atoms of an element are alike in all respects i.e. size, mass, density, chemical properties but they differ from the atoms of other elements.
- Atoms of an element combine in small numbers to form molecules of the element.
- Atoms of one element combine with atoms of another element in simple whole number ratio to form molecules of compounds.
- Atoms are the smallest units of matter that can take part in a chemical reaction during which only rearrangement of atoms takes place
APPEARS IN
संबंधित प्रश्न
Give the following a suitable word/phrase
The sub-atomic particle with negative charge and negligible mass.
Give the following a suitable word/phrase.
The electrons present in the outermost shell.
FILL IN THE BLANK
The electrons revolving in shells close to the nucleus are called ................... electrons.
FILL IN THE BLANK
The γ-rays are............................ radiations, like light.
Tick the most appropriate answer
β-particles are actually a stream of
- protons
- electrons
- neutrons
- none of these
WRITE SHORT ANSWER
What is the number of neutrons present in a potassium atom ?
ANSWER IN DETAIL
Name the three subatomic particles. How are they different from each other ?
Draw the electronic configuration of the following elements clearly stating the number of neutrons and protons in their nucleus.
a. Beryllium b. Silicon
c. Chlorine d. Aluminium
e. Nitrogen
Compare a proton and a neutron in respect of mass and charge.
Explain how the modern atomic theory contradicted Dalton’s atomic theory.
