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statuscvo [17]
3 years ago
8

Can anyone help to complete this question?

Chemistry
1 answer:
makkiz [27]3 years ago
5 0
1. Compound. 2. Dividing. 3. Relative Formula Mass. 4. Hundred.
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Selenium (Se) has 30 protons and 20 neutrons in each atom, therefore its atomic
allochka39001 [22]

Answer:

30, 50

Explanation:

Hello,

In this since an element's atomic number is equal to the number of protons in its atom, we can infer that selenium's atomic number is 30. Moreover, due to the fact the the neutrons are equal to the atomic mass minus the atomic number or the number of protons, by knowing the number of neutrons we compute the atomic as follows:

neutrons=mass-protons\\\\mass=neutrons+protons\\\\mass=30+20\\\\mass=50a.m.u

Thus, answer is 30, 50.

Best regards.

8 0
3 years ago
Type the correct answer in the box.
tatiyna

the mass of  1  mole of phosphorus atoms is approximately  30 g

hope this helps :)

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I  think it is AM and frequency

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If the pH changes from 5 to 6, the H+ would concentration would?
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Decrease by factor 10
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