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1. • Number of protons in the nucleus

     • Number of protons in the nucleus (atomic number): A higher number of protons increases the attractive forces between the positively charged protons and negatively charged electrons, pulling the electrons closer to the nucleus. This effect reduces the atom’s size, explaining why atoms generally become smaller across a period in the periodic table.
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     The Sizes of Atoms and Molecules | Edexcel GCSE Chemistry ...

2. People also ask

   Why does atomic size decrease across a period of elements?

   • But it's probably fine here. According to ChemWiki at UC Davis, "Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell. However, at the same time, protons are being added to the nucleus, making it more positively charged.

   atomic physics - Why do the radii decrease when we move left to right

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   How does atomic radius change across a period?

   • Ask your own question! The atomic radius of atoms generally decreases from left to right across a period. There are some small exceptions, such as the bismuth (Bi) radius being slightly greater than the polonium (Po) radius. Within a period, protons are added to the nucleus as electrons are being added to the same principal energy level.

   Why do atomic radii decrease across a period? - CK-12 Foundation

   www.ck12.org/flexi/chemistry/periodic-trends-atomic-radius/why-do-atomic-radii-decrease-across-a-period/

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   Why do atoms shrink over time?

   • This results in the effective nuclear charge rising significantly (as no. protons increases while added electrons are shielding inefficiently), which of course, means that the atom has a smaller size. Through the period, the core electron shell shrinks, because the charge of the nucleus increases.

   Why do atoms get smaller moving left to right on a periodic table?

   chemistry.stackexchange.com/questions/64676/why-do-atoms-get-smaller-moving-left-to-right-on-a-periodic-table

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   Why does atomic radius decrease from left to right?

   • Atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius. Atomic radius increases from top to bottom within a group.

   6.5: Periodic Trends - Chemistry LibreTexts

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   Why does atom size increase as atomic number increases?

   • The effect lessens as one moves further to the right in a period, because of electron-electron repulsions that would otherwise cause the atom's size to increase. The atomic radius of atoms generally increases from top to bottom within a group. As the atomic number increases down a group, there is again an increase in the positive nuclear charge.

   6.15: Periodic Trends- Atomic Radius - Chemistry LibreTexts

   chem.libretexts.org/Bookshelves/Introductory_Chemistry/Book:_Introductory_Chemistry_(CK-12)/06:_The_Periodic_Table/6.15:_Periodic_Trends-_Atomic_Radius

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   Why do atoms get smaller as we add more protons and electrons?

   • Now, as we add more protons and electrons, the attraction between the nucleus and shell increases and the shell contracts. Thus the atom gets smaller. *Shells reach 'til infinity, so it's better to define the size on the basis of 'the electrons of the outermost shell will be within this region x% of the time.'

   electrons - Why do atoms generally become smaller as one moves left to

   chemistry.stackexchange.com/questions/1/why-do-atoms-generally-become-smaller-as-one-moves-left-to-right-across-a-period

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3. chemistry.stackexchange.com › questions › 1Why do atoms generally become smaller as one moves left to ...

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   Apr 25, 2012 · It seems to me that the addition of electrons and protons as you move across a period would cause an atom to become larger. However, I'm told it gets smaller. Why is this?

4. chemistry.stackexchange.com › questions › 64676Why do atoms get smaller moving left to right on a periodic ...

   chemistry.stackexchange.com › questions › 64676

   When you move left to right on a periodic table, the protons increase at the same rate as the electrons. In fact, the number of electrons end up being the same as the number of protons, no matter how far you are across a period (unless it's an ion).

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6. socratic.org › questions › why-does-atomic-radiusWhy does atomic radius decrease as you go across a period?

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   Oct 20, 2015 · Atomic radius decreases across a period because valence electrons are being added to the same energy level at the same time the nucleus is increasing in protons. The increase in nuclear charge attracts the electrons more strongly, pulling them closer to the nucleus.

7. chem.libretexts.org › Bookshelves › Introductory6.15: Periodic Trends- Atomic Radius - Chemistry LibreTexts

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   Sep 20, 2022 · How does the atomic radius of different elements change across a period? How does atomic radius change from top to bottom within a group? Explain why the atomic radius of hydrogen is so much smaller than the atomic radius of potassium.

8. chem.libretexts.org › Courses › can6.5: Periodic Trends - Chemistry ... - Chemistry LibreTexts

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   Dec 10, 2023 · Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell. However, at the same time, protons are being added to the nucleus, making it more positively charged.

9. physics.stackexchange.com › questions › 169846Why do the radii decrease when we move left to right in the ...

   physics.stackexchange.com › questions › 169846

   According to ChemWiki at UC Davis, "Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell. However, at the same time, protons are being added to the nucleus, making it more positively charged.

10. www.ck12.org › flexi › chemistryWhy do atomic radii decrease across a period? - CK-12 Foundation

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    Why do atomic radii decrease across a period? Flexi Says: The atomic radius of atoms generally decreases from left to right across a period. There are some small exceptions, such as the bismuth (Bi) radius being slightly greater than the polonium (Po) radius.