Q14 of 17 Page 122

The chlorine atom is electrically neutral but chloride ion is charged. Explain.

Chlorine atomic number is 17 so its number of protons = number of electrons = 17 so chlorine atom is electrically neutral. But when chlorine atom is changed to chloride ion it has gained one electron so the number of electrons is more than a number of protons hence it is negatively charged.


More from this chapter

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12

Define valence of an element. Find the valency of chlorine and magnesium (At. No. of chlorine = 17, magnesium = 12).

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Complete the following table:

 15

(a) Write the name of the sub – atomic particle discovered by J. Chadwick. What type of charge occurs on this particle? In which part of an atom this particle is located?

(b) List three steps of an experiment performed by Rutherford for his model of an atom.


(c) Define isobar, write its one example.


(d) Which scientist concluded that the size of the nucleus is very small as compared to the size of an atom?

 16

(a) What is an octet? How do elements reach an octet?

(b) Make a schematic atomic structure of Magnesium of Phosphorus.


(Given: number of protons of Magnesium = 12, Phosphorus = 15).