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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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6 0
3 years ago
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5 0
3 years ago
Biologists use optical tweezers to manipulate micron-sized objects using a beam of light. In this technique, a laser beam is foc
vekshin1

Answer:

Explanation:

Part A) Using

light intensity I= P/A

A= Area= π (Radius)^2= π((0.67*10^-6m)/(2))^2= 1.12*10^-13 m^2

Radius= Diameter/2

P= power= 10*10^-3=0.01 W

light intensity I= 0.01/(1.12*10^-13)= 9*10^10 W/m^2

Part B)  Using

I=c*ε*E^2/2

rearrange to solve for E= \sqrt{((I*2)/(c*ε))

c is the speed of light which is 3*10^8 m/s^2

ε=permittivity of free space or dielectric constant= 8.85* 10^-12 F⋅m−1

I= the already solved light intensity= 8.85*10^10 W/m^2

amplitude of the electric field E= \sqrt{(9*10^10 W/m^2)*(2) / (3*10^8 m/s^2)*(8.85* 10^-12 F⋅m−1)

---> E= \sqrt{(1.8*10^11) / (2.66*10^-3) = \sqrt{(6.8*10^13) = 8.25*10^6 V/m    

 

8 0
3 years ago
During metamorphism, what is the major effect of chemically active fluids?
xz_007 [3.2K]

Answer:

Option b

Explanation:

Metamorphism is the process where the variation of the geological texture resulting from the different arrangement of the minerals or the variation of minerals in protoliths, i.e., pre- existing rocks take place such that there occurs no change in state of the protolith, i.e., it does not melt into magma.

The change takes place as a result of the presence of chemically active fluids, heat and pressure.

There is a reaction between the chemically active fluid and the rock through which it passes and promotes the movement of the dissolved ions of silicate and promotes the growth of the mineral grains.

7 0
3 years ago
2. How long must a 400 W electrical engine work in order to produce 300 kJ of work?
yanalaym [24]

Answer:

Explanation:

400 W = 400 J/s

300000 J / 400 J/s = 750 s or 12.5 minutes

7 0
3 years ago
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