Why Is the Atomic Size of Group 0 Elements Larger in Their Period?

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The atomic size of Group 0 (noble gases) elements is larger in their period due to the force of electron repulsion and the overall number of electrons, with radon having 86 electrons contributing to its size. Electronegativity plays a significant role, as elements with high electronegativity, like fluorine, are smaller due to their ability to hold electrons tightly to the nucleus. The discussion also touches on the confusion regarding the labeling of groups, with Group 0 sometimes referred to as Group 18 in traditional periodic tables. Francium is noted as having the least electron affinity, while noble gases are typically characterized by their low reactivity. The arrangement of the periodic table can affect the perception of atomic sizes across groups.
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Homework Statement



1. Why is the atomic size of 0 group elements more than that of the rest of the elements in that period?
2. Which is th element with least electron affinity?

Homework Equations



None

The Attempt at a Solution



1. Force of repulsion between the electrons is what my teacher tell me.
2. A noble gas or francium?

Help!
 
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ritwik06 said:
1. Why is the atomic size of 0 group elements more than that of the rest of the elements in that period?
1. Force of repulsion between the electrons is what my teacher tell me.
Which group is 0? My table has 1-18 across and 1-7 down. I've never seen a table that starts at 0.

Two main things affect size - electronegativity and overall number of electrons. Fluorine is very small because of its high electronegativity and low number of electrons; it can tightly hold electrons close to the nucleus. Potassium is big because of its low electronegativity; electrons stay far from the nucleus and can be easily pulled away by things like fluorine or oxygen. Radon is big because it has 86 electrons.

2. A noble gas or francium?

Francium.
 
Group 18 (noble gases) is sometimes referred to as group 0.

I've not actually seen a periodic table with this format. Does Group 0 actually get arranged to the left of group 1? In the more common version of the priodic table, group 18 elements have the smallest (not largest) atomic radii of all elements in a given period. But if you pushed that group to the left side and promoted every element to the next period, then the converse would be true.
 
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