GRE subject Test: Chemistry aid » general Chemistry » Elements and the periodic Table » routine Trends » atomic Radius
Explanation:

Most people clearly understand the atomic radius will boost as you go under the routine table. However, going indigenous left to appropriate will actually decrease atom radius. The reason is that the raised positive charge in the nucleus indigenous the added protons will certainly pull the electrons closer, decreasing the radius. That the provided options, arsenic and also selenium room in the lowest row, yet arsenic is more to the left. Together a result, it has the biggest atomic radius.

You are watching: Which element has the greatest atomic radius


Explanation:

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

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

When moving across a period, atom radius will decrease as the number of protons increases. This protons increase the attraction in between the high-energy electrons and the nucleus, properly "shrinking" the electron cloud.


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Example inquiry #3 : atomic Radius


Which of the complying with has the largest atomic radius?


Possible Answers:

*


*


*



Correct answer:


Explanation:

Atomic radius boosts with increasing efficient nuclear charge (Z). Elements toward the right and toward the peak of the routine table have the greatest Z values. Protons and electrons are added in pairs as we traverse the routine table indigenous left to right. A attractive force is established in between the positively-charged nucleus and also the negatively-charged electron cloud, which boosts as the variety of particles grows.

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


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Example inquiry #4 : atomic Radius


Which that the following aspects has the biggest atomic radius?


Possible Answers:

F


C


N


B


O


Correct answer:

B


Explanation:

Atomic radius have the right to be determined using the periodic trends. Atom radius rises to the left the a duration and under a group of the periodic table. Electronegativity, in contrast, increases to the ideal of a period and up a team of the routine table. Relating the two, we can see the the greater the atomic radius, the weaker that is electronegativity since the electrons are farther far from the nucleus and are unable to feeling the attractive pressure of the protons in the nucleus.


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Example question #5 : atom Radius


Which the the provided atoms has actually the smallest atomic radius?


Possible Answers:

Bi


N


P


As


Correct answer:

N


Explanation:

Nitrogen, phosphorous, antimony, and bismuth room all in the same group (column) the the periodic table.

The atom radius increases from the peak of a group to the bottom, as result of increased principle shell number (n). Together one travels under a group, one more s covering is added, definition that electron are added in one more orbit farther native the nucleus. This offer to rise the atomic radius that the atom.


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Example concern #6 : atomic Radius


Which the the given atoms has the largest atomic radius?


Possible Answers:

Ne


B


O


Li


Correct answer:

Li


Explanation:

Lithium, boron, oxygen, and also neon space all in the same row (period) that the regular table.

The atomic radius decreases native left to appropriate along a duration due come increased reliable nuclear force. Indigenous left to right the atomic number increases, denote that much more protons space added. The enhancement of protons increases the positive charge in the nucleus, pulling in the outer electrons by enhancing the efficient nuclear force, to decrease the radius.

In math terms, we have the right to equate efficient nuclear pressure using the force equation in between two fee particles.

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We can see the the farther apart the electrons and also protons are, the less the force is between them.


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Example question #7 : atomic Radius


Which of the adhering to would have actually the biggest atomic radius?


Possible Answers:

Iodine


Chlorine


Bromine


Flourine


Correct answer:

Iodine


Explanation:

Atomic radius rises down each team of the regular table and toward the left of every period. Because the elements provided are every in the very same group, iodine would have actually the greatest atomic radius since it farther down the duration compared come the others. 


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Example question #8 : atomic Radius


Which of the adhering to correctly defines the tendency for atomic radius in the periodic table that elements?


Possible Answers:

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


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


Atomic radius decreases v increasing power level. Atom radius remains constant as new electrons are included within the very same orbital.


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


Atomic radius decreases through increasing energy level. Atom radius rises as new electrons are added within the exact same orbital.


Correct answer:

Atomic radius increases with increasing energy level. Atom radius decreases as new electrons are included within the very same orbital.


Explanation:

Energy level rises moving under a group of the periodic table. As power level increases, the external valence shell becomes more distant native the nucleus, bring about atomic radius come increase.

Energy level remains constant across a period, but electrons are added within the exact same orbitals. When new electrons are included within the same orbital, extr protons space also included to the nucleus. This rises the reliable nuclear charge, pulling the electron closer come the nucleus. The trend for atom radius is come decrease together we relocate right follow me a row.

This means 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 concern #9 : atom Radius


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


Possible Answers:

Nitrogen


Calcium


Aluminum


Oxygen


Magensium


Correct answer:

Calcium


Explanation:

The radius of one atom is established by the sizes of the orbitals on its outermost shell. Below are the atom radius trends:

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

2. Atom radius decreases from left to ideal within every period.

Because calcium is located closest come the bottom ideal on the regular table, it has actually the highest atomic radius. Namely, this is as result of the fact that calcium"s highest energy electron is in the fourth power shell.


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Example concern #10 : atom Radius


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


Possible Answers:

Sodium


Phosphorus


Magnesium


Potassium


Nitrogen


Correct answer:

Nitrogen


Explanation:

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

1. Atom radius rises from optimal to bottom within every column.

2. Atomic radius decreases native left to ideal within a period.

Because nitrogen is furthest come the the height right on the routine table, it has actually the smallest atomic radius.


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