GRE subject Test: Chemistry assist » basic Chemistry » Elements and also the regular Table » regular Trends » atomic Radius
Explanation:

Most people plainly understand that atomic radius will rise as girlfriend go down the routine table. However, going from left to right will in reality decrease atomic radius. The reason is that the raised positive charge in the nucleus native the included protons will pull the electron closer, decreasing the radius. That the offered options, arsenic and also selenium are in the lowest row, however arsenic is more to the left. As a result, it has the biggest atomic radius.

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


Explanation:

The tendency for atomic radius is to increase going from top to bottom, as extr valence shells are included to the atom. Out of the answer choices, rubidium has actually the highest power valence shell.

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With a single electron in the fifth power level, krypton will have actually the highest variety of energy levels of the group I elements listed.

When moving throughout a period, atom radius will certainly decrease together the variety of protons increases. These protons boost the attraction between the high-energy electrons and also the nucleus, successfully "shrinking" the electron cloud.


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Example concern #3 : atomic Radius


Which of the complying with has the biggest atomic radius?


Possible Answers:

*


*


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Correct answer:


Explanation:

Atomic radius rises with increasing reliable nuclear fee (Z). Facets toward the right and also toward the peak of the regular table have the highest possible Z values. Protons and also electrons are added in pairs as we traverse the periodic table from left to right. A attractive force is established between the positively-charged nucleus and the negatively-charged electron cloud, which rises as the variety of particles grows.

When electron are included or taken away without the very same happening come a proton, an imbalance of fee accumulates. When much more electrons are current than normal, the electron cloud sags farther away from the nucleus. As soon as fewer electrons are existing than normal, the electron cloud is drawn in more tightly towards the nucleus. Atoms v extra electron (a negative charge) will have larger nuclei than their neutral counterparts. A chloride ion will certainly thus has a bigger atomic radius than argon, a potassium ion, or a calcium ion.


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Example question #4 : atomic Radius


Which of the following aspects has the greatest atomic radius?


Possible Answers:

F


B


N


O


C


Correct answer:

B


Explanation:

Atomic radius can be identified using the periodic trends. Atomic radius increases to the left that a period and under a team of the regular table. Electronegativity, in contrast, rises to the appropriate of a duration and up a group of the routine table. Relating the two, we can see that the higher the atomic radius, the weaker that is electronegativity due to the fact that the electrons space farther far from the nucleus and also are can not to feel the attractive force of the proton in the nucleus.


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Example question #5 : atomic Radius


Which that the offered atoms has actually the smallest atomic radius?


Possible Answers:

Bi


P


N


As


Correct answer:

N


Explanation:

Nitrogen, phosphorous, antimony, and bismuth are all in the same team (column) of the regular table.

The atom radius boosts from the optimal of a group to the bottom, because of increased principle shell number (n). As one travels under a group, one more s covering is added, meaning that electrons are included in an additional orbit farther from the nucleus. This serves to rise the atomic radius the the atom.


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Example concern #6 : atom Radius


Which the the provided atoms has the largest atomic radius?


Possible Answers:

B


O


Li


Ne


Correct answer:

Li


Explanation:

Lithium, boron, oxygen, and also neon room all in the same row (period) the the routine table.

The atom radius decreases native left to ideal along a period due come increased efficient nuclear force. Native left to ideal the atom number increases, describe that more protons space added. The addition of protons rises the positive charge in the nucleus, pulling in the external electrons by boosting the effective nuclear force, decreasing the radius.

In mathematics terms, we have the right to equate effective nuclear pressure using the pressure equation in between two fee particles.

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We deserve to see the the farther personally the electrons and also protons are, the much less the pressure is in between them.


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Example question #7 : atomic Radius


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


Possible Answers:

Bromine


Iodine


Flourine


Chlorine


Correct answer:

Iodine


Explanation:

Atomic radius increases down each team of the regular table and toward the left of every period. Because the elements provided are all in the same group, iodine would have actually the best atomic radius because it farther down the duration compared to the others. 


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Example inquiry #8 : atom Radius


Which of the following correctly defines the tendency for atom radius in the regular table of elements?


Possible Answers:

Atomic radius decreases with increasing energy level. Atomic radius remains consistent as new electrons are added within the exact same orbital.


Atomic radius decreases through increasing power level. Atom radius boosts as new electrons are added within the same orbital.


Atomic radius boosts with increasing power level. Atomic radius reduce as new electrons are included within the same orbital.


Atomic radius boosts with increasing power level. Atom radius boosts as brand-new electrons are added within the same orbital.


Atomic radius boosts with increasing power level. Atom radius remains consistent as new electrons are included within the very same orbital.


Correct answer:

Atomic radius increases with increasing power level. Atom radius decreases as new electrons are added within the exact same orbital.


Explanation:

Energy level boosts moving down a group of the periodic table. As energy level increases, the external valence covering becomes much more distant indigenous the nucleus, causing atomic radius come increase.

Energy level remains constant across a period, yet electrons are included within the exact same orbitals. When brand-new electrons are added within the same orbital, added protons room also included to the nucleus. This increases the reliable nuclear charge, pulling the electrons closer come the nucleus. The tendency for atomic radius is to decrease together we move right follow me a row.

This method that the basic trend for atomic radius is to increase as one move to the left and bottom on the periodic table.


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Example question #9 : atomic Radius


Which atom would certainly be meant to have the largest atomic radius?


Possible Answers:

Magensium


Aluminum


Oxygen


Calcium


Nitrogen


Correct answer:

Calcium


Explanation:

The radius of an atom is figured out by the size of the orbitals on its outermost shell. Below are the atomic radius trends:

1. Atom radius boosts from height to bottom within every column.

2. Atom radius decreases indigenous left to best within every period.

Because calcium is situated closest to the bottom best on the regular table, it has the highest possible atomic radius. Namely, this is because of the reality that calcium"s highest energy electron is in the fourth energy shell.


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Example question #10 : atom Radius


Which atom would certainly be supposed to have the smallest atomic radius?


Possible Answers:

Magnesium


Sodium


Phosphorus


Potassium


Nitrogen


Correct answer:

Nitrogen


Explanation:

The radius of an atom is identified by the sizes of the orbitals ~ above its outermost shell. Below are the atom radius trends:

1. Atomic radius rises from top to bottom within every column.

2. Atomic radius decreases indigenous left to appropriate within a period.

Because nitrogen is furthest to the the optimal right ~ above the periodic table, it has the smallest atomic radius.


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