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प्रश्न
Which of the following statements made by Dalton has not undergone any change?
विकल्प
Atoms cannot be broken.
Atoms combine in small, whole numbers to form compounds.
Elements are made up of atoms.
All atoms of an elements are alike
उत्तर
All atoms of an elements are alike.
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संबंधित प्रश्न
WRITE SHORT ANSWER
What is radioactivity?
What does an atom consist of ? Explain.
Name the particles which revolve around the nucleus.
Name three non-metals/radicals which have valency -1, -2, and -3.
Define: Covalent bond
What does the word ‘atom’ mean?
Name the particle or particles you would expect to find in :
The nucleus of an atom
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
How is the size of an atom indicated ?
State two observations which show that atom is not indivisible.
Which of the following statement is correct about the atom of an element ?
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- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
Select the correct answer to the statement given below:
The basic unit of matter is not capable of independent existence.
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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
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 ______.
