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Soloha48 [4]
3 years ago
15

How do I determine valence electrons from the periodic table

Physics
2 answers:
tensa zangetsu [6.8K]3 years ago
5 0

Determine which group the element is in, and that will be however many valence electrons there are. Such as group one has one valence electron, group two has two valence electrons, group three has three valence electrons and so on.

Hope this helps!

Mkey [24]3 years ago
3 0

For neutral atoms, the number of valence electrons is equal to the atom's main group number. The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons.

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What is the output voltage from a step up transformer with 25 turns in the primary coil and 75 turns in the secondary coil if th
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Answer:

360 V

Explanation:

We can use the transformer equation:

\frac{V_p}{N_p}=\frac{V_s}{N_s}

where

V_p is the primary (input) voltage

N_p is the number of turns in the primary coil

V_s is the secondary (output) voltage

N_s is the number of turns in the secondary coil

In this problem,

V_p = 120 V\\N_p = 25\\N_s = 75

Substituting into the equation, we can find the output voltage:

V_s = N_s \frac{V_p}{N_p}=(75)\frac{120}{25}=360 V

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It's 300! I just got it correct:)

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