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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
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संबंधित प्रश्न
Fill in the blank
The outermost shell of an atom is known as............................
Give the following a suitable word/phrase.
Protons and neutrons present in the nucleus.
Give the following a suitable word/phrase
Arrangement of electrons in the shells of an atom.
Name three fundamental particles of the atom. Give the symbol with charge, on each particle.
WRITE SHORT ANSWER
Describe a discharge tube.
ANSWER IN DETAIL
Write a note on valence shell.
State whether the following statement is true or false :
The anode rays obtained from all the gases consist of positively charged particles called protons.
State the location of electrons, protons and neutrons in an atom.
If an atom ‘A’ has an atomic number of eleven, state the number of protons and electrons it contains.
Select the correct answer from the choice in the bracket to complete the sentence:
An element ‘X’ has six electrons in its outer or valence shell. Its valency is __________.
