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3 years ago

7

If Element X has 85 protons, how many electrons does it have

2 answers:

BartSMP [9]3 years ago

7 0

It has 85 electrons, because an element always has the same number of electrons and protons

melamori03 [73]3 years ago

5 0

If element X has 85 protons, then it has 85 electrons.
No matter what element it is, there will ALWAYS be the same amount of protons as there are electrons.

By the way, thanks for asking this question. I just learned this yesterday, so it gave me a way to show what I learned.

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_Cl2 + _NaBr → _NaCl + _Br2<br><br> Answer: 1,2,2,1

nlexa [21]

1 2 2 1 is the answer so u are correct

4 0

2 years ago

What is the total probability of finding a particle in a one-dimensional box in level n = 4 between x = 0 and x = L/8?

Lubov Fominskaja [6]

Answer:

P = 1/8

Explanation:

The wave function of a particle in a one-dimensional box is given by:

$\psi = \sqrt \frac{2}{L} sin(\frac{n \pi x}{L})$

Hence, the probability of finding the particle in the one-dimensional box is:

$P = \int_{x_{1}}^{x_{2}} \psi^{2} dx$

$P = \int_{x_{1}}^{x_{2}} (\sqrt \frac{2}{L} sin(\frac{n \pi x}{L}))^{2} dx$

$P = \frac{2}{L} \int_{x_{1}}^{x_{2}} (sin^{2}(\frac{n \pi x}{L}) dx$

Evaluating the above integral from x₁ = 0 to x₂ = L/8 and solving it, we have:

$P = \frac{2}{L} [\frac{L}{16} (1 - 4\frac{sin(\frac{n \pi}{4})}{n \pi})]$

$P = \frac{1}{8} (1 - 4\frac{sin(\frac{n \pi}{4})}{n \pi})$

Solving for n=4:

$P = \frac{1}{8} (1 - 4\frac{sin(\frac{4 \pi}{4})}{4 \pi})$

$P = \frac{1}{8} (1 - \frac{sin (\pi)}{\pi})$

$P = \frac{1}{8}$

I hope it helps you!

7 0

2 years ago

What is 25 m rounded to one significant figure

den301095 [7]

Rounded to 1 significant figure, 25 m would go to 30. This is because 0 isn't significant, so the 3 is the only significant figure.

8 0

2 years ago

Read 2 more answers

The atmospheric pressure in Francisco on ascertain day was 97.6kpa what was the pressure on mmhg

vodka [1.7K]

Answer:

732.0601 mmHg

Explanation:

Given data:

Pressure = 97.6 KPa

Given pressure in mmHg = ?

Solution:

Kilo pascal and millimeter mercury both are units of pressure.

Kilo pascal is denoted as "KPa"

Millimeter mercury is denoted as " mmHg"

Kilo pascal is measure of force per unit area while also define as newton per meter square.

It is manometric unit of pressure. It is the pressure generated by column of mercury one millimeter high.

Conversation of kilopascal to mmHg:

97.6 × 7.501 = 732.0601 mmHg

3 0

2 years ago

The charge on a magnesium ion is +2. When it formed an ionic compound with another element, it lost 2... what?

Naya [18.7K]

Answer: electrons

Explanation: Electrons have a charge of -1 each. If two left, the remaining atom would have a positive +2 change.

6 0

2 years ago