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From the symbol underset(2)overset(4)"" ...

From the symbol `underset(2)overset(4)"" He` for the element helium, write down! the mass number and the atomic number of the element.

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ICSE-ATOMIC STRUCTURE AND CHEMICAL BONDING-EXERCISE 4(C)
  1. Define the terms: element

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  2. Define the terms: orbit.

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  3. From the symbol underset(2)overset(4)"" He for the element helium, wri...

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  4. Five atoms are labelled A to E. Which one of these atoms : (i) ...

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  5. Five atoms are labelled A to E. Write down the formula of the com...

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  6. Five atoms are labelled A to E. Predict : (i) metals (ii) non-met...

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  7. An atom of an element has two electrons in the M shell. What is the (a...

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  8. overset(24)underset(12)" " Mg and overset(26)underset(12)" " Mg are sy...

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  9. overset(24)underset(12)" " Mg and overset(26)underset(12)" " Mg are sy...

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  10. What are nucleons? How many nucleons are present in phosphorus ? Draw ...

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  11. What are isotopes? With reference to which fundamental particle do iso...

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  12. Why do overset(35)underset(17)" " CI and overset(37)underset(17)" " CI...

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  13. Explain fractional atomic mass. What is the fractional mass of chlorin...

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  14. What is meant by "atomic number of an element"?

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  15. Write down the electronic configuration of (i) chlorine atom (ii) chlo...

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  16. Name the following An element which does not contain any neutron

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  17. Name the following: An element having valency 'zero'.

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  18. Name the following: Metal with valency 2.

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  19. Name the following: Two atoms having the same number of protons and...

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  20. Name the following: The shell closest to the nucleus of an atom.

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