Explanation:

Ionization energy goes up across the duration and down as you go down the group. This is the energy required to eliminate an electron. That the noted elements it would be hardest to remove an electron indigenous Flourine as the positive nucleus close to the electron orbitals has higher attractive force.

You are watching: Which of these elements has the smallest atomic radius?


Explanation:

Helium has actually the smallest atomic radius. This is due to trends in the periodic table, and the reliable nuclear charge that holds the valence electrons close come the nucleus. Atom radius decreases as you move across a duration from left to right and also decreases as you relocate up a group from bottom come top. Since He is in ~ the top right-hand corner of the table, it must have the smallest atomic radius.


Explanation:

The periodic table enables you to follow basic guidelines or "trends" the are shown on the table. Atom radius is one such trend. As you relocate down in groups, more shells are added to the atom which results in an increase in radius. Together you move to the best on the periodic table, the atom charge boosts which traction the elctrons closer come the nucleus. Together a result, the atomic radius will decrease when relocating to the right.


Explanation:

Atomic radius decreases as you move left to appropriate on the routine table. Together atomic number increases, so does the variety of positive protons in the nucleus. Come the much left that a period, electrons space widespread in ~ a brand-new electronic shell. Come the far right that the period, the electrons still occupy the same shell, but experience better attractive force toward the nucleus as result of the higher number of proton present.

While it is true the flourine is the most electronegative element, this go not affect atomic radius (though the two patterns follow comparable patterns).


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Example inquiry #19 : routine Trends


The distinction in the atom radii of fluorine and also lithium is most comparable to the difference in the atom radii of which pair of elements?


Possible Answers:

As and also Se


Fe and Br


Cs and Bi


Na and also Cl


Be and also B


Correct answer:

Na and also Cl


Explanation:

The atomic radius of facets decreases together one move from left to right throughout the routine table. The degree to which lithium has a bigger atomic radius than fluorine is most similar to the distinction between one more pair of facets within the very same groups, that are additionally found top top the left and also right sides of the table.

Fluorine and also chlorine room both halogens, and lithium and sodium are both alkali metals. Fluorine and also lithium room both in the 2nd period, and sodium and also chlorine space both in the third. As you move from lithium to fluorine throughout the table, you will see comparable changes and also patterns together if girlfriend were moving from sodium to chlorine.


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Example question #20 : regular Trends


Which that the adhering to atoms has the largest atomic radius?


Possible Answers:

Oxygen


Fluorine


Sulfur


Chlorine


Correct answer:

Sulfur


Explanation:

When predicting how atomic radius will readjust as you relocate along the routine table, psychic these two trends.

1. As you move down the table in a provided group, the atom radius that the atoms will increase.

2. As you relocate left to best in a offered period, the atom radius will decrease.

Knowing this, we have the right to compare the feasible options. Sulfur and chlorine room in the shortest period, therefore they have the biggest atomic radii. Since sulfur is to the left of chlorine on the routine table, that will have a bigger atomic radius. Together a result, sulfur has actually the biggest atomic radius the end of the feasible options.


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Example inquiry #21 : regular Trends


Which of the following atoms has actually the smallest atomic radius?


Possible Answers:

Chlorine


Nitrogen


Oxygen


Sulfur


Fluorine


Correct answer:

Fluorine


Explanation:

As friend move throughout a single period (row) ~ above the regular table, the atomic radius of each successive atom decreases. Together you move down a single group (column), the atomic radius the each succeeding atom increases. As you move down a group, the maximum energy level of the valence covering increases, thus increasing the dimension of the electron cloud and atomic radius. Together you move across a duration to the right, the variety of protons in the cell nucleus increases. This also increases the attraction between the positively-charged nucleus and negatively-charged electrons, pulling the electron in tighter and also reducing the atom radius.

The smallest atoms are going come be situated toward the upper ideal of the routine table. Of our given answer choices, fluorine is the closest come the top right, and thus has actually the smallest radius.


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Example inquiry #22 : periodic Trends


Which that the complying with values walk not boost as you relocate left to right in a period of the regular table?


Possible Answers:

Ionization energy


Electronegativity


Electron affinity


Atomic radius


Correct answer:

Atomic radius


Explanation:

Atomic radius will certainly decrease together you relocate to the right, due to the fact that the atomic variety of the element will be increasing. This results in a more positively charged nucleus the pulls the electrons closer to the center. Together a result, atom radius will especially decrease from left to right.

Electronegativity, ionization energy, and also electron affinity all boost to the right of the regular table.


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Example question #23 : periodic Trends


List the following elements in stimulate of decreasing atom radius.

Neon, fluorine, chlorine, oxygen, sodium, magnesium

 


Possible Answers:


*


*


*


*


Correct answer:


Explanation:

Within the same period of the periodic table, atom radii decrease together there are more charged particles to tempt one another, and within the very same group, atomic radii increases. The increase from the ascending group normally speaking is bigger than the decrease under a period.

Four that the elements detailed are in ~ the very same period, so we will ar those four aspects in bespeak of decreasing atom radii:

*

Now we simply need to place Neon, Fluorine, and also Oxygen, which room in the very same period. The tendency of decreasing radii with boosting atomic number is not true because that noble gases, as they have actually a complete octet and are slightly larger to counter electron-electron repulsion indigenous the octet. In stimulate of decreasing atomic radius:

*

The boost from the octet is less than the rise from electron-electron repulsion.


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Example question #24 : regular Trends


Which of the following have the biggest atomic radii within their respective durations (row)?


Possible Answers:

The noble gases


Transition metals


Alkali metals


Halogens


Correct answer:

Alkali metals


Explanation:

The alkali steels are discovered in the an initial group (column) the the regular table, top top the outward side. They have only 1 loose bound electron in your outermost shells, and also their effective nuclear charge values are low, providing them the largest atomic radii of all the aspects in their periods.

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