Successive shells of electrons being added
Explanation:
The increase in atomic size within a group on the periodic table as the atomic number increases is a result of the successive shells of electrons being added. The size of an atom is estimated using the atomic radius.
- Down a group, from top to bottom, atomic radii increases.
- This due to the successive shells of electrons being added.
- The shells have been more than compensated for by the size reducing effect of the increased nuclear charged.
- As with most atoms, the inner electronic shells tends to screen/shield the outermost electrons from experiencing the nuclear attractions.
- The screening effect tends to reduce the atomic size.
- Atomic number is the number of protons in an atom. For a neutral atom, it is the same as the number of electrons.
- As the atomic number increases down a group, the number of electrons also increases and the atomic radii expands.
Learn more:
Periodic table https://brainly.com/question/1971327
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