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तामिळनाडू बोर्ड ऑफ सेकेंडरी एज्युकेशनएस.एस.एल.सी. (इंग्रजी माध्यम) इयत्ता ८

Which of the following statements made by Dalton has not undergone any change? - Science

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प्रश्न

Which of the following statements made by Dalton has not undergone any change?

पर्याय

  • 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

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उत्तर

All atoms of an elements are alike.

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पाठ 12: Atomic Structure - Exercises [पृष्ठ १३६]

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सामाचीर कलवी Science [English] Class 8 TN Board
पाठ 12 Atomic Structure
Exercises | Q I. 4. | पृष्ठ १३६

संबंधित प्रश्‍न

Tick the most appropriate answer.

Who discovered that radioactive rays are given out by uranium?

  1. Henri Becquerel
  2. Marie Curie
  3. Pierre Curie
  4. Schmidt

Write the names of `("NH"_4)_2"SO"_4` compounds:


Write the names of `"Ca"("NO"_3)_2` compounds :


How did Neils Bohr visualise the atom ?


How is the size of an atom indicated ?


State two observations which show that atom is not indivisible.


The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.


How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)


In what respects do the three isotopes of hydrogen differ? Give their structures.


Draw the diagrams representing the atomic structures of the following: Neon


Elements X and Y have 1 and 7 electrons in their outermost shell respectively.

Which will form positive ion?


State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.


Draw the basic structure of an atom representing its –

  1. Subatomic particles
  2. Nucleus
  3. Orbits or shells.

Select the correct answer to the statement given below:

Imaginary path around the nucleus of an atom in which electrons revolve.


K: Potassium:: C: ______.


In all atoms of an element


1 mole of Gold and Silver contain same number of atoms.


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 ______.


______ is a substance that is made up of three oxygen atoms chemically combined.


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