CHEMISTRY HIGH SCHOOL

What is the number of electrons in a completely filled second shell of an atom?(1) 32 (2) 2 (3) 18 (4) 8

Answers

Answer 1
Answer:

The number of electrons in a completely filled second shell of an atom will be 8.

What is atom?

The basic number of ordinary components that make up a chemical element is just an atom.

What is shell?

As per Bohr's atomic model, electrons orbit or shell surrounding the nucleus in a precise circular path.

It is known that by the electronic configuration atoms posses 2,8,18,32.

Hence, there are 8 electron will be found in second shell of the atom.

The number of electrons in a completely filled second shell of an atom will be 8.

To know more about shell and atom.

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Answer 2
Answer: The number of electrons in a completely filled second shell of an atom is 8.
Hope this helped. 

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End-of-chapter questionsi Apart from saving money, why is it important to recycle as many substances as possible?2 A farmer uses slaked lime (Ca(oH),) and ammonium sulfate to increase the fertility of his fieldsa What type of soil might the farmer use lime on?b which essential element will ammonium sulfate add to the soil?c What reaction could take place between slaked lime and ammonium sulfate?Lime (Cao) is manufactured from limestone by heating it strongly.d What is the chemical formula oflimestone?48Cambridge IGCSE Chemistry

Answers

1. to save space as less goes to landfill
2. acidic soil as OH is alkali
3. nitrates (ammonia is nitrogen and hydrogen)
4. I don't know this one sorry
5. CaCO3 is limestone and when it is heated its called thermal decomposition

Which of the following is most likely to be amorphous?-glass
-solid sulfur
-solid calcium
-gold

Answers

Answer: Option (a) is the correct answer.

Explanation:

Amorphous means without any crystalline structure or definite shape. Whereas a solid whose atoms are not bonded together in a definite lattice pattern. This solid is non-crystalline in nature.

For example, glass, gel, plastic etc are all amorphous solids.

Whereas solid sulfur, solid calcium, and gold have a definite lattice pattern and has a crystalline structure. Thus, they are not amorphous solids.

Thus, we can conclude that out of the given options glass is most likely to be amorphous.
the best answer here would be glass.

A lack of sewage structures in overcrowded cities may lead to __________.a. a higher carrying capacity
b. larger urban heat islands
c. poor public health
d. a greater support capacity

Answers

A lack of sewage structures in overcrowded cities may lead to poor public health. Therefore, the correct option is C.

A sewage system, also known as a wastewater management system, is a system of pipes, pumping stations, and other accessories used to transport sewage from points of origin to points of treatment and disposal.

Combination sewers are systems that transport sewage from both domestic and storm sources. Due of the significant amounts of storm water that must be transported during wet weather conditions, combined sewers usually are made up of big pipes or tunnels. Public health may suffer in densely populated cities with inadequate sewage systems.

Learn more about sewage system, here:

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A lack of swage structures in overcrowded cities will lead to poor public health, the less structures to hold the mass of peoples sewage will have bacteria in the air causing bacterial infections.   

Which element has the greatest electronegativity?a. Chlorine
b. Oxygen
c. Sulfur
d. Phosphorus
e. Fluorine

Answers

Fluorine has the highest. Fluorine's electronegativity is 4.0

Water (H2O) is considered a mineral because it is inorganic and occurs naturally.a. True
b. False

Answers

b.false because water is not mineral

Carbon can share a maximum of how many of its valence electrons when bonding to other atoms?2

4

6

Cannot be determined

Answers

Carbon can share a maximum of four of its valence electrons when bonding to other atoms. This is the reason why organic molecules can be so large because of this bonding. Suppose you have a compound of CCl4. You know that chlorine can only share 1 electron because 7 of its electrons are filled. Also, in carbon, it can only share 4 electrons because 4 of it are already filled. That is why carbon needs four chlorine to form CCl4.
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