Which element has 2 electrons in the outermost energy level

1 answer:

3 0

Helium, and other Group 2 elements. This would include the elements beryllium, magnesium, calcium, strontium, barium, and radium.

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Which statement describes the relative masses of two different particles?

garik1379 [7]

The answer is 2. Beta particle is high energy electrons which is the same mass as positron with little mass. Alpha particle consists of 2 neutrons and 2 protons. Neutrons and protons have almost same mass which is much larger than electrons.

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the details on p. 99, in of wolves and men that describes how the wolf's fur carries seeds to depersed along his trail reveals..

Ymorist [56]

Answer is: the author’s perspective on events.

The book Of Wolfes and Men was written in 1978 by Barry Holstun Lopez.

Barry Lopez (1945 -) is an American author, essayist and fiction writer.

On this page, the wolf is not noticing the seeds on his fur. Seeds fall off as the wolf moves along the trail, so only author can make this observation.

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How much heat is relesed when 10 g of water is cooled from 80 C to 20 C

masha68 [24]

Answer:

Explanation:

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Hydrogen-3 has a half-life of 12.32 years. A sample of H-3 weighing 3.02 grams is left for 15.0 years. What will the final weigh

kaheart [24]

Answer:

$\large \boxed{\text{1.38 g}}$

Explanation:

Two important formulas in radioactive decay are

$(1) \qquad t_{\frac{1}{2}} = \dfrac{\ln 2}{k}\\\\(2) \qquad \ln \left(\dfrac{N_{0}}{N}\right) = kt$

1. Calculate the decay constant k

$\begin{array}{rcl}t_{\frac{1}{2}} &=& \dfrac{\ln 2}{k}\\\\\text{12.32 yr} &= &\dfrac{\ln 2}{k}\\\\k & = & \dfrac{\ln 2}{\text{12.32 yr}}\\\\& = & \text{0.056 26 yr}^{-1}\\\end{array}$

2. Calculate the mass remaining

$\begin{array}{rcl}\ln \left(\dfrac{A_{0}}{A}\right) &= &kt \\\\\ln \left(\dfrac{\text{3.20 g}}{A}\right) &= &\text{0.056 26 yr}^{-1}\times \text{15 yr} \\\\\ln \left(\dfrac{\text{3.20 g}}{A}\right) &= &0.8439 \\\\\dfrac{\text{3.20 g}}{A} &= &e^{0.8439} \\\\\dfrac{\text{3.20 g}}{A}&= &2.325 \\\\A &= &\dfrac{\text{3.20 g}}{2.325}\\\\&= & \textbf{1.38 g}\\\end{array}\\\text{The final mass of the sample will be $\large \boxed{\textbf{1.38 g}}$}$

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3 years ago

3. Examine the chemical formulas for the Arrhenius acids in Model 1. What feature do all the

Nostrana [21]

Answer:

They all have a hydrogen written separatly towards the beginning of the formula.

Explanation:

If you look at the Arrhenius acid formulas, you can see they all contain a hydrogen (H) at the beginning of them.

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