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exis [7]
3 years ago
6

1. How does the period (row) in which an element is located relate to the number of shells that contain electrons?

Chemistry
1 answer:
Kamila [148]3 years ago
4 0

1. The period number tells us about the number of shells in an element(for example Na located in third period has three electron shells)

2. Group number tells us the amount of electrons present in the valence shell thus also tells us about the ionic charges they form

3. They all have a stable electronic configuration with complete valence shells hence they also don't form ions.

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A certain shade of blue has a frequency of 7.28×1014 Hz.
Lyrx [107]

Explanation:

the enerfy of of one photon of this light is 4.85x10^-19 J

<h2>E= 6.63 x 10^-34 J/S x 7.32 x10^14 S ^-1</h2>

E= 4.85x10^-19 J

7 0
2 years ago
If Mary likes Johnny, but Johnny likes Katie, and Katie likes Mary. What do they do?
RUDIKE [14]

Answer:

love triangle?- orr they can figure something out

8 0
2 years ago
Read 2 more answers
It takes 560 J of energy to raise the temperature of 130.6 g mercury from 20.0°C to 66.5 °C.
Anestetic [448]

Answer:

0.0922 J/g°C

Explanation:

Use the formula Q=mc(delta)T. My teacher called it "M"cat to help my class remember it. Q-energy(560J) M-mass(130.6g) c(specific heat) is what you are solving for and delta T is the change in temperature(66.5-20.0). Put these values in the formula and solve for c.

5 0
2 years ago
Which is not among the current strategies used to prevent lead poisoning?
Mama L [17]

The answer is labels on lead-based paint

Lead is highly toxic metal and it is very strong poison. Lead poising takes place when lead builds up in the body. A little amount of lead can also cause various health problems.  

Labels on lead-based paint do not prevent lead poisoning as much as advised to not using such product.

Instead of using lead-based paint, people could use safer products such as titanium-white based paint, which is proved to be less toxic.

Thus, option (A) is correct answer i.e. labels on lead-based paint is not among the current strategies which is used to prevent lead poisoning.


4 0
2 years ago
Read 2 more answers
_____ radiation also occurs in waves, of varying wavelength and frequency.​
GalinKa [24]

Electromagnetic waves

Unlike mechanical waves, these waves can travel though vacuum because they do not need a medium of travel.

Explanation:

This is how sunlight reaches earth. Sunlight has many wavelengths if electromagnetic waves called an electromagnetic spectrum. The electromagnetic spectrum ranges from the high energy waves called gamma rays (they have the shortest wavelength and highest frequency). On the other end of the spectrum are the lowest energy waves called radio waves (they have the longest wavelength and lowest frequency).

Learn More:

Check more on electromagnetic radiation here;

brainly.com/question/1551400

brainly.com/question/1530050

#LearnWithBrainly

8 0
3 years ago
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