Rank from most to fewest valance electrons

1 answer:

5 0

The question is not clear. Do you mean what's the maximum amount of valence electrons a shell could hold? If that's what you meant then the first shell can hold 2, the second can hold 6, the third can hold 8. If you're in University then the answer would be different however.

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Help please the questions are confusing

SashulF [63]

Answer:

5- number of electrons=11

Explanation:

in a neutral atom number of protons=number of electrons which in this case=11

3 0

3 years ago

Read 2 more answers

Finish this statement: The colder it is the _______________ it is

zloy xaker [14]

"cooler" is your answer

8 0

3 years ago

Which statements are true? Δ???? for an exothermic reaction is positive. Δ???? for an endothermic reaction is positive. The evap

LuckyWell [14K]

Answer: The true statements are $\Delta H$ for an endothermic reaction is positive, a combustion reaction is exothermic and when energy is transferred as heat from the system to the surroundings, $\Delta H$ is negative.

Explanation:

There are 2 types of chemical reactions categorized into heat change:

Endothermic reactions: These reactions are defined as the reactions in which energy is absorbed by the system from the surroundings. The $\Delta H$ for these reactions is always positive. For Example: Changing of water into water vapor.
Exothermic reactions: These reactions are defined as the reactions in which energy is released by the system to the surroundings. The $\Delta H$ for these reactions is always negative. For Example: Combustion reactions.

Combustion reactions are defined as the reactions in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide and water. Heat is released during these reactions. Thus, it is considered as exothermic reactions.

Hence, the true statements are $\Delta H$ for an endothermic reaction is positive, a combustion reaction is exothermic and when energy is transferred as heat from the system to the surroundings, $\Delta H$ is negative.

6 0

3 years ago

Why must energy be absorbed to change a liquid to a gas?

Komok [63]

Answer: Heat energy is absorbed to vaporize a liquid because molecules which are held together by intermolecular forces in the liquid are separated as the gas is formed

Explanation:whatever that means^ I looked it up

4 0

2 years ago

Silica, sio2, is formed on silicon as an electrically insulating layer for microelectronic devices. silica is formed when silico

MAVERICK [17]

Answer:

The question continues; At this same temperature, how long (total time, in minutes) would it take for oxygen to diffuse to form a 0.13 micron thick layer of SiO2? Assume that the silicon can be treated as a semi-infinite solid with a constant concentration of oxygen at the surface. (Hint: What is true of the oxygen concentration at the Si/SiO2 interface?

Explanation:

The application of Grahams law of diffusion comes in; It states that at constant temperature and pressure, the rate of diffusion of a gas is inversely proportional to the square root of its relative molecular mass or the square root of its density.

The detailed step by step explanayion and application of grahams law is as shown in the attachment.

5 0

3 years ago