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Chemistry
4. Structure of Atom
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Q32 of 149 Page 211

What are valence electrons? Where are valence electrons situated in an atom?

Valance electrons are the number of electrons present in the valance shell. In the outermost shell valance electrons are present.


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For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.

31

An element has Z = 7. What is the valency of the element? Also name the element.

32

What is the number of valence electrons in the atoms of an element having atomic number 13? Name the valence shell of this atom.

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What are isotopes? Explain by giving an example.

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4. Structure of Atom
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