Chemistry, 04.12.2019 09:31 kayciemarie9486

Atomic radii from the left to right across a period tend to: increase. decrease. atomic radii from the top to the bottom of a group tend to: increase. decrease.

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Decrease left to right because there are more electrons in the same level squishing to the nucleus
Increase top to bottom because there is a new electron cloud level, so some outer electrons are shielded from the nucleus, causing them to not try as hard to squish in.
Hope that helps!

Answer from: marcgotbox

Answer :

Atomic radii from the left to right across a period tend to decrease.

Atomic radii from the top to the bottom of a group tend to increase.

Explanation :

Atomic radius of an atom is defined as the total distance from the nucleus to the valence shell of the atom.

As moving from left to right in a period, more electrons are added in the same shell and the attraction between the last electron and nucleus increases, which results in the shrinkage of size of an atom.

Thus, atomic radii from the left to right across a period tend to decrease.

As moving from top to bottom in a group, there is an addition of shell around the nucleus and the outermost shell gets far away from the nucleus and hence, the distance between the nucleus and outermost shell increases.

Thus, atomic radii from the top to the bottom of a group tend to increase.

Answer from: Quest

58750.08068 is the answer i think

Answer from: Quest

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. $hbr$ completely dissociates to $h^+$ and $br-$ ions. a is incorrect because $h_2s$ does not fully ionize to $h^+$ and $hs^-$ ions and some remain as the compound $h_2s$ . c and d are incorrect because, $li_2o$ and $libr$ do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise, if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both $li_2o$ and $libr$ have a complete octet so can not accept any electrons which disqualifies them as acids.

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Atomic radii from the left to right across a period tend to: increase. decrease. atomic radii from...