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Which of the following statement is alwa...

Which of the following statement is always correct?

A

an atom has equal number of electrons and protons

B

an atom has equal number of electrons and neutrons

C

an atom has equal number of protons and neutrons

D

an atom has equal number of electrons, protons and neutrons.

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The correct Answer is:
A
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LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
  1. The ion of an element has 3 positive charges. The mass number of atom ...

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  2. The first model of an atom was given by

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  3. Which of the following statement is always correct?

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  4. From the symbol .(15)^(31)P, state : (i) mass number of phosphorus,...

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  5. The atom of an element X has 7 electrons in its M shell (a) Write th...

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  6. An atom of element E contains 3 protons, 3 electrons and 4 neutrons : ...

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  7. An atom of an element X may be written as .(4)^(9)X What does the fi...

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  8. The electronic configuration of an element Z is 2, 8, 8. (a) What is...

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  9. The total number of electrons in a nitrogen atom is 7. Find the number...

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  10. What is the general name of the elements having 8 electrons in the val...

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  11. Which noble gas has less than 8 electrons in the valence shell of its ...

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  12. State on use of radioactive isotopes in medicine.

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  13. Give one example of a radioactive isotope which is used as a fuel in t...

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  14. Name the ratioactive isotopes which is used in the treatment of cancer...

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  15. Which radioactive isotope is used to determine the activity of thyroid...

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  16. State one use of radioactive isotopes is industry.

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  17. State whether the following statement is true is false : Radioactive...

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  18. What name is given to those atoms which contain the same numer of prot...

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  19. What is the relationship between an atom containing 11 protons, 11 ele...

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  20. What name is given to the pair of atoms such as .(7)^(14) N and .(7)^(...

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