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In which of the following is there a consistent decrease in atomic radius as the atomic number increases?
- a)halogens
- b)representative elements
- c)transition elements
- d)lanthanides
Correct answer is option 'B'. Can you explain this answer?
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In which of the following is there a consistent decrease in atomic ra...
In general, there is a consistent decrease in atomic radius as the atomic number increases in the b) representative elements. This trend is also known as the "size effect."
The representative elements are a group of elements in the periodic table that includes the s-block elements (alkali metals and alkaline earth metals) and the p-block elements (halogens and noble gases). As the atomic number increases within this group, the number of protons in the nucleus also increases, which attracts the valence electrons more strongly. This results in a decrease in the size of the atom.
The halogens, c) transition elements, and d) lanthanides also show some decrease in atomic radius as the atomic number increases, but this trend is not as consistent as it is in the representative elements. For example, the atomic radius of the halogens decreases as the atomic number increases from fluorine to chlorine, but then increases again as the atomic number increases from chlorine to iodine. The transition elements and lanthanides also show some deviation from the general trend due to the presence of d-orbitals and the effects of electron shielding.
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In which of the following is there a consistent decrease in atomic ra...
Representative Elements
- The representative elements are the elements in the s and p blocks of the periodic table.
- As you move from left to right across a period in the periodic table, the atomic number increases, resulting in a consistent decrease in atomic radius.
- This trend is due to the increasing number of protons in the nucleus, which leads to a stronger attraction for the electrons and a decrease in the size of the atom.
- The increase in the effective nuclear charge also plays a role in pulling the electrons closer to the nucleus, further decreasing the atomic radius.
- Therefore, among the given options, the representative elements exhibit a consistent decrease in atomic radius as the atomic number increases.
- The representative elements are the elements in the s and p blocks of the periodic table.
- As you move from left to right across a period in the periodic table, the atomic number increases, resulting in a consistent decrease in atomic radius.
- This trend is due to the increasing number of protons in the nucleus, which leads to a stronger attraction for the electrons and a decrease in the size of the atom.
- The increase in the effective nuclear charge also plays a role in pulling the electrons closer to the nucleus, further decreasing the atomic radius.
- Therefore, among the given options, the representative elements exhibit a consistent decrease in atomic radius as the atomic number increases.
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In which of the following is there a consistent decrease in atomic radius as the atomic number increases?a)halogensb)representative elementsc)transition elementsd)lanthanidesCorrect answer is option 'B'. Can you explain this answer?
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