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solniwko [45]
2 years ago
14

An atom with 39 protons and a mass number of 89 what is the number of neutrons

Chemistry
1 answer:
Liula [17]2 years ago
4 0

Answer:

50

Explanation:

the number of neutrons is gotten from the subtraction of the number of protons from the mass number

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Convert 296 degrees Celsius to Kelvin.<br> A. 23 K<br> B. 552 K<br> C. 569 K<br> D. 550 K
katovenus [111]

Answer:

option c) 552 K is correct

Explanation:

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The amount left after 20 years = 154.15 mg

<h3>Further explanation </h3>

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually radioactive elements have an unstable atomic nucleus.  

The main particles are emitted by radioactive elements so that they generally decay are alpha (α), beta (β) and gamma (γ) particles  

The decay formula for isotope :

\tt \large{\boxed{\bold{A(t)=217e^{-0.0171t}}}

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\tt A(t)=217e^{-0.0171\times 20}\\\\A(t)=154.15~mg

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3 years ago
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