GRE topic Test: Chemistry aid » basic Chemistry » Elements and the regular Table » routine Trends » atom Radius
Explanation:

Most people plainly understand that atomic radius will boost as you go down the periodic table. However, going native left to best will in reality decrease atom radius. The reason is that the enhanced positive charge in the nucleus from the added protons will certainly pull the electrons closer, to decrease the radius. Of the given options, arsenic and selenium room in the shortest row, but arsenic is an ext to the left. Together a result, it has actually the biggest atomic radius.

You are watching: Which of the following atoms has the greatest atomic radius?


Explanation:

The tendency for atom radius is to rise going from optimal to bottom, as extr valence shells are included to the atom. The end of the answer choices, rubidium has actually the highest energy valence shell.

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

When moving across a period, atomic radius will certainly decrease as the number of protons increases. These protons increase the attraction between the high-energy electrons and the nucleus, efficiently "shrinking" the electron cloud.


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Example inquiry #3 : atomic Radius


Which of the adhering to has the biggest atomic radius?


Possible Answers:

*


*


*



Correct answer:


Explanation:

Atomic radius increases with increasing reliable nuclear fee (Z). Aspects toward the right and toward the height of the routine table have actually the greatest Z values. Protons and electrons are added in pairs as we traverse the routine table indigenous left come right. A attractive force is established between the positively-charged nucleus and also the negatively-charged electron cloud, which increases as the variety of particles grows.

When electron are included or taken far without the exact same happening to a proton, one imbalance of fee accumulates. When an ext electrons are current than normal, the electron cloud sags farther far from the nucleus. Once fewer electrons are existing than normal, the electron cloud is attracted in more tightly towards the nucleus. Atoms with extra electrons (a an adverse charge) will have actually larger nuclei than their neutral counterparts. A chloride ion will thus has actually a larger atomic radius 보다 argon, a potassium ion, or a calcium ion.


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Example question #4 : atom Radius


Which that the following facets has the best atomic radius?


Possible Answers:

F


B


N


O


C


Correct answer:

B


Explanation:

Atomic radius have the right to be established using the periodic trends. Atom radius increases to the left the a period and under a team of the routine table. Electronegativity, in contrast, increases to the appropriate of a duration and increase a group of the routine table. Relating the two, we have the right to see that the better the atom radius, the weaker its electronegativity since the electrons room farther away from the nucleus and also are can not to feeling the attractive pressure of the protons in the nucleus.


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Example inquiry #5 : atom Radius


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


Possible Answers:

Bi


P


N


As


Correct answer:

N


Explanation:

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

The atom radius rises from the top of a group to the bottom, as result of increased principle covering number (n). As one travels under a group, another s shell is added, meaning that electron are included in an additional orbit farther indigenous the nucleus. This offer to increase the atomic radius the the atom.


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Example inquiry #6 : atom Radius


Which of the offered atoms has actually the largest atomic radius?


Possible Answers:

B


O


Li


Ne


Correct answer:

Li


Explanation:

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

The atomic radius decreases from left to best along a period due come increased efficient nuclear force. Indigenous left to right the atomic number increases, denote that more protons are added. The enhancement of protons rises the hopeful charge in the nucleus, pulling in the outer electrons by increasing the efficient nuclear force, diminish the radius.

In mathematics terms, we can equate reliable nuclear pressure using the pressure equation in between two charged particles.

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We deserve to see the the farther apart the electrons and protons are, the much less the force is between them.


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Example concern #7 : atom Radius


Which of the following would have actually the greatest atomic radius?


Possible Answers:

Bromine


Iodine


Flourine


Chlorine


Correct answer:

Iodine


Explanation:

Atomic radius rises down each team of the routine table and toward the left of each period. Due to the fact that the elements noted are all in the same group, iodine would have actually the best atomic radius due to the fact that it farther down the period compared come the others. 


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Example question #8 : atomic Radius


Which the the following correctly describes the trend for atom radius in the regular table that elements?


Possible Answers:

Atomic radius decreases v increasing power level. Atom radius remains consistent as brand-new electrons are included within the exact same orbital.


Atomic radius decreases v increasing energy level. Atom radius boosts as brand-new electrons are added within the same orbital.


Atomic radius rises with increasing energy level. Atomic radius decreases as new electrons are added within the very same orbital.


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


Atomic radius rises with increasing power level. Atom radius remains continuous as new electrons are added within the exact same orbital.


Correct answer:

Atomic radius rises with increasing power level. Atomic radius to reduce as brand-new electrons are added within the very same orbital.


Explanation:

Energy level increases moving down a group of the periodic table. As energy level increases, the outer valence shell becomes an ext distant from the nucleus, bring about atomic radius come increase.

Energy level remains continuous across a period, yet electrons are included within the exact same orbitals. When new electrons are included within the exact same orbital, additional protons are also included to the nucleus. This boosts the efficient nuclear charge, pulling the electron closer come the nucleus. The tendency for atom radius is to decrease as we relocate right follow me a row.

This way that the general trend for atomic radius is to increase as one moves to the left and bottom on the periodic table.


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Example question #9 : atom Radius


Which atom would be intended to have actually the largest atomic radius?


Possible Answers:

Magensium


Aluminum


Oxygen


Calcium


Nitrogen


Correct answer:

Calcium


Explanation:

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

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

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

Because calcium is situated closest come the bottom ideal on the routine table, it has the greatest atomic radius. Namely, this is due to the truth that calcium"s highest energy electron is in the fourth energy shell.


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Example inquiry #10 : atom Radius


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


Possible Answers:

Magnesium


Sodium


Phosphorus


Potassium


Nitrogen


Correct answer:

Nitrogen


Explanation:

The radius of an atom is determined by the sizes of the orbitals top top its outermost shell. Below are the atom radius trends:

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

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

Because nitrogen is furthest come the the top right top top the periodic table, it has the smallest atomic radius.


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