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Lynna [10]
3 years ago
12

What does the atomic number of an element specify? what does the atomic number of an element specify?

Chemistry
1 answer:
GREYUIT [131]3 years ago
8 0
The atomic number of an element identifies the number of protons and electrons.
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Calculate the weight of 5 atoms of Mg.​
kumpel [21]

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2.0179701e-22

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3 years ago
The half-life of radium-226 is 1,600 years. It decays into radon-222. What fraction of the original amount of radium-226 in a sa
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6 0
2 years ago
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Which electron transition represents a gain of energy?
xz_007 [3.2K]

The correct answer is (A) from 2nd to 3rd shell.


The explanation :


when a gain of energy is the shift of the electrons from a shell of low energy to the shell of high energy


and we have here 2nd shell is the shell of low energy, and 3rd shell is the shell of high energy.


∴ (A) from 2nd to 3rd shell is the correct answer.

5 0
3 years ago
I need help please thank you
Kazeer [188]

Answer:

In science, sound is defined as the transfer of energy from a vibrating object in waves that travel through matter. Most people commonly use the term sound to mean what they hear when sound waves enter their ears. The tree above generated sound waves when it fell to the ground, so it made sound according to the scientific definition

Explanation:

sound waves

4 0
2 years ago
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Calculate the number of moles when 3.00l of a gas at 814 mmhg and 25 °c?
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  • Volume=V=3L
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So

No of moles=n

\\ \rm\rightarrowtail PV=nRT

\\ \rm\rightarrowtail n=\dfrac{PV}{RT}

\\ \rm\rightarrowtail n=\dfrac{814(3)}{25R}

\\ \rm\rightarrowtail n=2442/25R

\\ \rm\rightarrowtail n=97.7Rmol

5 0
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