Question

Question 2.4 Write the complete symbol for the atom with the given atomic number (Z) and Atomic mass (A)

(i) Z = 17, A = 35

(ii) Z = 92, A = 233

(iii) Z = 4, A = 9

Class XI Structure of Atom Page 65

Answer 1

(i) aluminium ..Al
(ii) uranium ..U
(iii)beryllium..Be

Answer 2

if we see the symbol of atoms having atomic number ( Z ) : 17, 92 and 4 respectively in the periodic table.
because we know,
chemical and physical properties of elements are periodic function of their atomic number .
so, I have to see atomic number for identifying of any atoms.

(i) ³⁵₁₇Cl [ because , Chlorine is the element whose atomic number is 17 .]

(ii) ²³³₉₂U [ Uranium ]

(iii) ⁹₄Be [ Berylium ]