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Sveta_85 [38]
3 years ago
12

Sodium (Na) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence elec

trons does potassium have?
0



1



9



11
Chemistry
2 answers:
lapo4ka [179]3 years ago
8 0
It's 1 because there is only one electron on the outer shell.
Studentka2010 [4]3 years ago
5 0

Answer: Option (b) is the correct answer.

Explanation:

As it is known that both sodium and potassium are same group elements. Both of then belongs to group 1A.

Since, sodium is at 11th position in the periodic table and its atomic number is also 11. Therefore, electronic distribution of sodium is 2, 8, 1.

Similarly, potassium is placed at 19th position in the periodic table and its atomic number is 19. So, electronic distribution of potassium is 2, 8, 8, 1.

It is known that valence electrons are the electrons present in the outermost shell of an atom.

So, in a potassium atom there is only one valence electron is present.

Thus, we can conclude that potassium have 1 valence electron.

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Heat is transferred directly from a heat reservoir at 200 C to another heat reservoir at 5C. If the amount of heat transferred i
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Answer:

ΔS=0.148  KJ/K

Explanation:

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Reservoir 1 is rejecting heat that is why it taken as negative while the reservoir 2 is gaining the heat that is why it is taken as positive.

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ΔS=  - Q/T₁ + Q/T₂

ΔS=  - 100/473 + 100/278  KJ/K

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