9. In a period, do the number of shielding electrons change? Why do you thinkor shielding electrons change? Why do you think atomic radius decreases across a
period?

Answers

Answer 1

Answer:

Answer:

The nuclear charge increases, but the number of inner shielding electrons stays the same.

Explanation:

Their shielding does not change, so the effective nuclear charge — the charge felt by a valence electron — increases.

The valence electrons are pulled closer to the nucleus, decreasing the atomic radius.

For example, consider the elements of Period 3.

$\begin{array}{ccccc}& & \textbf{Number of} & \textbf{Inner} & \textbf{Valence}\n\textbf{At. No.} & \textbf{Symbol} & \textbf{Protons} & \textbf{Electrons} & \textbf{Electrons}\n11& \text{Na} & 11 & 10 & 1\n12& \text{Mg} &12 & 10 & 2\n13& \text{Al} & 13 & 10 & 3 \n14& \text{Si} & 14 & 10 & 4 \n15& \text{P} & 15 & 10 & 5\n16& \text{S} & 16 & 10 & 6\n17& \text{Cl} & 17 & 10 & 7\n18& \text{Ar} & 18 & 10 & 8 \n\end{array}$

The number of protons increases as you go from one element to the next, but the number of inner electrons is constant.

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what is the chemical formula for concentrated plutonium exploding and igniting hydrogen and how could it be stabilized? i'm not doing this IRL, so don't worry!

Answers

Basically, an atomic bomb relying on pure fission like a plutonium bomb works by chain reactions. However, something must initiate the chain of reactions : that's where Hydrogen comes in:

the fission reaction of Uranium is $U+n\rightarrow Sr+Xe+2n$ where n is a neutron. Hydrogen is basically a neutron and an electron; it's thus quite easy to start the reaction with hydrogen.

There is no known way to significantly reduce radioactive decay as far as I know (I might be wrong), or to turn radioactive plutonium into non-radioactive plutonium without tearing the molecules apart.

explain why lighting a sparkler is considered a spontaneous reaction even though it doesn't stat start spontaneously

Answers

Lighting a sparkler is considered a spontaneous reaction even though it doesn't start spontaneouslybecause it can occur by itself, or without the influence of any external forces once it is given the necessary energy needed for it to begin the reaction.
The lighting of a sparkler is a common example of a spontaneous reaction which is often given in Science textbooks and exams around the world.

A 'spontaneous reaction' in chemistry refers to a reaction that continues on its own once started, not a reaction that starts spontaneously. A sparkler, once lit, undergoes a combustion reaction that needs no additional energy input.

The term spontaneous reaction in chemistry does not mean that a reaction starts spontaneously without any trigger. It actually refers to a reaction that, once started, continues without any additional external input. In the case of a sparkler, the initial energy to start the reaction is provided by lighting the sparkler. Once lit, the combustion reaction continues on its own, making it a spontaneous reaction.

The reactants in the sparkler (often metal powders and an oxidizing agent) are in a higher energy state than the products (typically metal oxides and heat) they form during burning. This difference in energy drives the reaction forward, making it spontaneous. The overall energy of the system decreases, which aligns with the principle of thermodynamics stating that a spontaneous process leads to a decrease in the system's free energy.

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Please helpRadiocontrast dyes are considered safe because the isotopes have short half-lives and the isotopes coat the gastrointestinal tract and are not absorbed by normal tissue. If a patient ingests 10.0 mg of iodine, how long until the iodine-134 is 99% out of the patient's system if the half-life of iodine-134 is 52.6 minutes?

Answers

In 52.6 mins the 10 mg of iodine will be divided by its half-life which is 2 it will become 5 mg (in 52.6 minutes ) and same procedure will be followed until it reach 99% out of the patient's system.

The answer is 368 minutes will it takes the iodine to be absorbed in one's system.

Which of the following is NOT correct about elements?(10 Points)

A. Elements cannot be broken down into simpler substances.

B. Elements are represented by chemical formulas.

C. Elements are pure substances.

D.Elements can combine chemically to form compounds.

Answers

Answer:

It is B.

All the other answers are true.

A element can not be simpler

Final answer:

The correct answer is B. Elements are represented by chemical formulas.

Explanation:

Out of the given options, the correct answer is B. Elements are represented by chemical formulas.

Chemical formulas are used to represent compounds, not elements. Elements are pure substances that are made up of only one type of atom and cannot be broken down into simpler substances. They are represented by their chemical symbols, such as H for hydrogen and O for oxygen.

For example, water is a compound made up of two elements: hydrogen and oxygen. The chemical formula for water is H2O, where H represents hydrogen and O represents oxygen.

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Sam lives in the city of Springdale and is interested in how the climate in his city compares to the climate in Ecuador. Which of the following is a testable question that could help him make this comparison?Is the climate in Ecuador better than the climate in Springdale?

Do high pressure systems prefer forming in Ecuador compared to in Springdale?

Are thunderstorms in Ecuador as scary as thunderstorms in Springdale?

Are average yearly temperatures in Ecuador greater than in Springdale?

Answers

Both "Do high pressure systems prefer forming in Ecuador compared to in Springdale?" and "Are average yearly temperatures in Ecuador greater than in Springdale?" are acceptable questions. The others deal with subjectivity.

Final answer:

The only testable question from the options provided would be asking if the average yearly temperatures in Ecuador are greater than those in Springdale. This question allows for a factual comparison using data.

Explanation:

When comparing climates, we must focus on quantitative, measurable aspects. So, the testable question here most appropriate for Sam's inquiry would be: Are average yearly temperatures in Ecuador greater than in Springdale?. This question relies on measurable, empirical data related to the large scale weather patterns of two distinct geographic locations. It will allow a factual analysis of the differences in climate between Springdale and Ecuador, specifically in terms of average yearly temperatures.

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5)
» A change in
means that a chemical reaction has occurred.

Answers

Answer:

C) the properties and identity of the reacting substances

Explanation:

took the test

Answer:

.....

Explanation:

Chemical changes occur when bonds between atoms are broken and new bonds form. As a result, new substances are produced. There are four signs that a chemical reaction has occurred: a change in color, a change in temperature, formation of a gas or formation of a precipitate.

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