Question

Write the appropriate symbol for each of the following isotopes: (a) Z 11, A 23; (b) Z= 28, A= 64; (c) Z= 50, A =115; (d) Z= 20, A= 42.

Answer 1

Explanation:  

Z = atomic mass of the element and  , A = atomic mass of the element .

a) Z = 11, A =  23

Element = Sodium

  symbol: ²³₁₁Na  .

b) Z = 28, A =  64

Element = Nickel

  symbol: ⁶⁴₂₈Ni  .

c) Z = 50, A = 115

Element = tin

  symbol: ¹¹⁵₅₀Sn  .

d) Z = 20, A = 42

Element = Calcium

  symbol: ⁴²₂₀Ca .

Answer 2

Answer:

(a) $^{23}_{11}Na$

(b) $^{64}_{28}Ni$

(c) $^{115}_{50}Sn$

(d) $^{42}_{20}Ca$

Explanation:

Hello,

In this case, Z stands for the isotope's atomic number and A for the isotope's atomic mass, in such a way, looking for each isotope one concludes that the proper symbol, in the form of $^{A}_{Z}Element$ turn out being:

(a) $^{23}_{11}Na$

(b) $^{64}_{28}Ni$

(c) $^{115}_{50}Sn$

(d) $^{42}_{20}Ca$

Best regards.