Q31 of 203 Page 152

The atomic number of an element X is 13. What will be the number of electrons in its ion X3+?

X3+ indicates loss of three electrons. Hence the remaining no. of electrons present are 10.

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30

Define ‘formula unit’ of an ionic compound. What is the formula unit of (i) sodium chloride, and (ii) magnesium chloride?

 30

Calculate the formula masses of the following compounds:

(i) Calcium chloride


(ii) Sodium carbonate


(Given: Atomic masses: Ca = 40 u; Cl = 35. 5 u; Na = 23 u; C = 12 u; O = 16 u)

 32

Which of the following represents a correct chemical formula?

 33

If the number of electrons in an ion Z3- is 10, the atomic number of element Z will be: