GRE Subject Test: Chemistry Assistance » General Chemisattempt » Elements and also the Periodic Table » Periodic Trends » Atomic Radius
Explanation:

Most world clearly understand also that atomic radius will increase as you go down the regular table. However before, going from left to right will certainly actually decrease atomic radius. The reason is that the raised positive charge in the nucleus from the included proloads will certainly pull the electrons closer, decreasing the radius. Of the given options, arsenic and selenium are in the lowest row, however arsenic is more to the left. As an outcome, it has the largest atomic radius.

You are watching: Which of the following has the largest atomic radius


Explanation:

The trend for atomic radius is to rise going from top to bottom, as added valence shells are included to the atom. Out of the answer selections, rubidium has the greatest power valence shell.

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With a single electron in the fifth power level, krypton will have the highest possible number of power levels of the team I facets provided.

When moving throughout a period, atomic radius will decrease as the variety of proloads rises. These prolots rise the attraction in between the high-energy electrons and also the nucleus, properly "shrinking" the electron cloud.


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Example Concern #1 : Atomic Radius


Which of the following has the largest atomic radius?


Possible Answers:

*



*


*


Correct answer:


Explanation:

Atomic radius boosts through increasing efficient nuclear charge (Z). Elements towards the appropriate and also towards the optimal of the regular table have actually the highest possible Z values. Proloads and also electrons are included in pairs as we traverse the periodic table from left to right. A attrenergetic force is establimelted between the positively-charged nucleus and also the negatively-charged electron cloud, which rises as the variety of pposts grows.

When electrons are added or taken away without the exact same happening to a proton, an imbalance of charge accumulates. When even more electrons are current than normal, the electron cloud sags farther ameans from the nucleus. When fewer electrons are current than normal, the electron cloud is drawn in more tightly towards the nucleus. Atoms through extra electrons (a negative charge) will certainly have actually larger nuclei than their neutral countercomponents. A chloride ion will certainly hence has actually a larger atomic radius than argon, a potassium ion, or a calcium ion.


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Example Question #1 : Atomic Radius


Which of the complying with aspects has actually the greatest atomic radius?


Possible Answers:

F


C


N


B


O


Correct answer:

B


Explanation:

Atomic radius have the right to be established using the regular trends. Atomic radius boosts to the left of a duration and also dvery own a group of the periodic table. Electronegativity, in comparison, rises to the ideal of a duration and also up a group of the routine table. Relating the two, we deserve to check out that the higher the atomic radius, the weaker its electronegativity because the electrons are farther away from the nucleus and are unable to feel the attrenergetic pressure of the proloads in the nucleus.


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Example Inquiry #1 : Atomic Radius


Which of the provided atoms has the smallest atomic radius?


Possible Answers:

P


Bi


As


N


Correct answer:

N


Explanation:

Nitrogen, phosphorous, antimony, and also bismuth are all in the exact same group (column) of the periodic table.

The atomic radius boosts from the height of a team to the bottom, due to raised principle shell number (n). As one travels down a team, an additional s shell is included, meaning that electrons are added in another orlittle farther from the nucleus. This serves to rise the atomic radius of the atom.


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Example Question #1 : Atomic Radius


Which of the provided atoms has the largest atomic radius?


Possible Answers:

O


B


Li


Ne


Correct answer:

Li


Explanation:

Lithium, boron, oxygen, and neon are all in the very same row (period) of the regular table.

The atomic radius decreases from left to right alengthy a duration due to boosted efficient nuclear pressure. From left to best the atomic number boosts, indicating that even more prolots are added. The enhancement of prolots rises the positive charge in the nucleus, pulling in the external electrons by enhancing the effective nuclear force, decreasing the radius.

In math terms, we deserve to equate reliable nuclear force making use of the pressure equation between two charged pwrite-ups.

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We deserve to view that the farther apart the electrons and also prolots are, the less the pressure is between them.


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Example Concern #31 : Periodic Trends


Which of the adhering to would certainly have actually the best atomic radius?


Possible Answers:

Chlorine


Flourine


Iodine


Bromine


Correct answer:

Iodine


Explanation:

Atomic radius rises down each group of the routine table and towards the left of each period. Because the elements noted are all in the same team, iodine would have the greatest atomic radius because it farther dvery own the duration compared to the others. 


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Example Question #1 : Atomic Radius


Which of the following properly defines the trend for atomic radius in the periodic table of elements?


Possible Answers:

Atomic radius increases through increasing power level. Atomic radius decreases as brand-new electrons are added within the very same orbital.


Atomic radius decreases through enhancing energy level. Atomic radius increases as brand-new electrons are included within the same orbital.


Atomic radius decreases with raising energy level. Atomic radius remains constant as new electrons are added within the same orbital.


Atomic radius increases via raising energy level. Atomic radius rises as brand-new electrons are added within the same orbital.


Atomic radius increases with raising power level. Atomic radius stays continuous as new electrons are added within the same orbital.


Correct answer:

Atomic radius increases through enhancing energy level. Atomic radius decreases as new electrons are included within the very same orbital.


Explanation:

Energy level boosts moving dvery own a team of the periodic table. As power level rises, the outer valence shell becomes more distant from the nucleus, causing atomic radius to rise.

Energy level continues to be consistent throughout a period, yet electrons are included within the exact same orbitals. When new electrons are included within the same orbital, additional prolots are likewise included to the nucleus. This rises the efficient nuclear charge, pulling the electrons closer to the nucleus. The trend for atomic radius is to decrease as we relocate best along a row.

This implies that the basic trfinish for atomic radius is to increase as one moves to the left and downward on the regular table.


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Example Concern #2 : Atomic Radius


Which atom would be supposed to have the largest atomic radius?


Possible Answers:

Magensium


Aluminum


Nitrogen


Calcium


Oxygen


Correct answer:

Calcium


Explanation:

The radius of an atom is determined by the sizes of the orbitals on its outermany shell. Below are the atomic radius trends:

1. Atomic radius increases from peak to bottom within each column.

2. Atomic radius decreases from left to ideal within each period.

Since calcium is located closest to the bottom right on the regular table, it has actually the greatest atomic radius. Namely, this is as a result of the fact that calcium"s greatest energy electron is in the fourth power shell.


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Example Question #1 : Atomic Radius


Which atom would be meant to have actually the smallest atomic radius?


Possible Answers:

Phosphorus


Nitrogen


Potassium


Magnesium


Sodium


Correct answer:

Nitrogen


Explanation:

The radius of an atom is established by the sizes of the orbitals on its outerthe majority of shell. Below are the atomic radius trends:

1. Atomic radius increases from optimal to bottom within each column.

2. Atomic radius decreases from left to best within a period.

Due to the fact that nitrogen is furthest to the the top ideal on the periodic table, it has actually the smallest atomic radius.


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