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Stells [14]
3 years ago
12

Use the periodic table to identify the number of core electrons and the number of valence electrons in each case below. Potassiu

m (K): 1s22s22p63s23p64s1 core electrons valence electrons
Physics
2 answers:
gogolik [260]3 years ago
6 0

Answer:

Potassium has one valence electron.

Potassium has 18 core electron.

Explanation:

Valance electron:

Valence electron is a electron present in the outermost shell of the atom. Potassium electron has 19 electrons. The outermost shell of potassium has only one electron present in it. Thus, Potassium has one valence electron.

Core electrons:

Core electrons are present in the inner shell of atom and it is given by,

Number of core electron = Atomic number - Number of valence electron

Number of core electron = 19 - 1

Number of core electron = 18

Thus, Potassium has 18 core electron.


pogonyaev3 years ago
3 0
18 core elections 
one valance election

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Answer:

True

Explanation:

Insight therapies are very powerful psychological tools used by therapist to help them unlock their past and provide a better well being and a more sound future.

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Suppose you read in the newspaper that a new planet has been found. Its average speed in its orbit is 33 kilometers per second (
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E. Kepler's second law says the planet must move fastest when it is closest, not  when it is farthest away.

Explanation:

We can answer this question by using Kepler's second law of planetary motion, which states that:

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This means that when a planet is further away from the Sun, it will move slower (because the line is longer, so it must move slower), while when the planet is closer to the Sun, it will move faster (because the line is shorter, so it must move faster).

In the text of this problem, it is written that the planet moves at 31 km/s when is close to the star and 35 km/s when it is farthest: this is in disagreement with what we said above, therefore the correct option is

E. Kepler's second law says the planet must move fastest when it is closest, not  when it is farthest away.

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time to travel the next 6km: 6 / 90 = 1/15 (h)

[I think there's problem in the question 'cause 900km/h sounds impossible for normal person to travel in normal condition]

The total time: 3/25 + 1/15 = 14/75 (h)

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8 0
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