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klasskru [66]
3 years ago
12

The number of neutrons in the nucleus of an atom can be determined by

Chemistry
1 answer:
Masteriza [31]3 years ago
5 0
Option no. 2 subtracting the atomic number from the mass number

Example: Zn - 65 atomic weight or mass/mass number
                       30 atomic number
  
                 65-30 = 35 number of neutrons

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SOMEONE HELP PLS ILL GIVE BRAINLIEST AND 19 PT
Ahat [919]

Sample left = 6.25 g

The percentage = 6.25%

<h3>Further explanation</h3>

Given

t1/2 = half-life = 3.8 days

t = decay time = 15.2 days

No = initial sample = 100 g

Required

Nt = final sample left

The percentage

Solution

General formulas used in decay:  

\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}

Input the value :

\tt N_t=100.\dfrac{1}{2}^{15.2/3.8}\\\\N_t=100.\dfrac{1}{2}^4\\\\N_t=6.25~g

The percentage : Nt/No

6.25 : 100 = 6.25%

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3 years ago
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MAXImum [283]
Hello!

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I hope this helped!

I am, yours most sincerely,
SuperHeperThingy
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3 years ago
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