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otez555 [7]
3 years ago
7

How many neutrons does element X have if its atomic number is 43 and its mass number is 164?

Physics
2 answers:
Brilliant_brown [7]3 years ago
7 0
The atomic number is 43. This means it is Technetium. If its mass number is 164, then the number of neutrons is: 164 - 43 = 121. It has 121 neutrons.
Drupady [299]3 years ago
6 0
Hello, 
The mass number is protons+neutrons=mass number. In this case, we have protons+nuetron=164.The atomic number is simply the number of protons so we have 43+neutrons=164. Subtracting 43 from both sides we get nuetrons=121. Hope this helps!
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Veronica claims that she can throw a dart at a dartboard from a distance of 2 m and hit the 5 cm wide bullseye if she throws the
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t = 2 m/ 15 m/s = 0.133 s

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3 years ago
Choose the three statements that are true about valence electrons.
Varvara68 [4.7K]

We have that valence electrons poses the three characteristics stated, as

Group 14 (carbon group)  are identified by 4 valence electrons.

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Group 14 (carbon group)  are identified by 4 valence electrons.

Option A,B,C

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2 years ago
Voltage needed to raise current to 3.75a using 20,20,200 resistor set
Varvara68 [4.7K]

<u>Answer:</u> The voltage needed is 35.7 V

<u>Explanation:</u>

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Using above equation, we get:

\frac{1}{R}=\frac{1}{20}+\frac{1}{20}+\frac{1}{200}\\\\\frac{1}{R}=\frac{10+10+1}{200}\\\\R=\frac{200}{21}=9.52\Omega

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V=IR         .....(1)

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