Q7 of 400 Page 167

The atomic number of an element X is 8 and that of element Y is 12. Write downthe symbols of the ions you would expect to be formed from their atoms.

The atomic number of an element X is 8 and that of element Y is 12. The X will form X2-, Y will form Y2+.

More from this chapter

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6 The atomic number of sodium is 11. What is the number of electrons in Na+? 6 The atomic number of chlorine is 17. What is the number of electrons in CI-? 8 Write down the electronic configuration of

(i) magnesium atom, and


(ii) magnesium ion. (At. No. of Mg = 12)

 8 Write down the electronic configuration of

(i) sulphur atom, and


(ii) sulphide ion. (At. No. of S = 16)