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ivann1987 [24]
3 years ago
8

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.
Chemistry
2 answers:
prohojiy [21]3 years ago
6 0

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 .

Elden [556K]3 years ago
4 0

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.

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Answer: 1709.4 Joules

Explanation:

The quantity of Heat Energy (Q) released on cooling a heated substance depends on its Mass (M), specific heat capacity (C) and change in temperature (Φ)

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