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2 years ago

What is the atomic mass of neon? Give your answer to the nearest tenth.

Physics

2 answers:

Artemon [7]2 years ago

7 0

Answer: To the nearest tenth is 20.2

Explanation:

Rasek [7]2 years ago

6 0

The atomic mass of neon is 20 amu.

20 amu = 10 p + 10 n

Neon has an atomic number , Z = 10 and contains 10 protons and 10 neutrons. It can completely filled electron shells and it is thus a noble gas. i.e. the number of 10 protons in the nucleus which defines the element.

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2 years ago

Chegg ) Alice owns 20 grams of a radioactive isotope that has a half-life of ln(4) years. (a) Find an equation for the mass m(t)

stepladder [879]

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$m(t)=20e^{-0.5t}$

Explanation:

Given:

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$m(t)\to mass\ after\ 't'\ years\\t\to years\ passed\\k\to rate\ of\ decay\ per\ year$

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$\frac{m_0}{2}=m_0e^{-k\times\ln 4}\\\\0.5=e^{-k\times\ln 4}\\\\Taking\ natural\ log\ on\ both\ sides,we\ get:\\\\\ln(0.5)=-k\times \ln 4\\\\k=\frac{\ln 0.5}{-\ln 4}=0.5$

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$m(t)=20e^{-0.5t}$

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3 years ago

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