Chemistry, 07.12.2019 02:31 Tyjon16

What is the correct order of decreasing size of the following ions? multiple choice ca2+ > k+ > cl– > p3– k+ > cl– > ca2+ > p3– p3– > cl– > k+ > ca2+ correct k+ > cl– > p3– > ca2+ none of these choices are correct.

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Answer from: Calirose

$P^{3-}$ > $Cl^{-}$ > $K^{+}$ > $Ca^{2+}$

Explanation:

Isoelectronic specie are defined as the molecules which have the same number of electrons.

Atomic number of calcium is 20 and thus has 20 electrons. $Ca^{2+}$ is formed by loss of 2 electrons and thus has 18 electrons.

Atomic number of potassium is 19 and thus has 19 electrons. $K^{+}$ is formed by loss of 1 electron and thus has 18 electrons.

Atomic number of chlorine is 17 and thus has 17 electrons. $Cl^{-}$ is formed by gain of 1 electron and thus has 18 electrons.

Atomic number of phosphorous is 15 and thus has 13 electrons. $P^{3-}$ is formed by gain of 3 electrons and thus has 18 electrons.

As the number of electrons are same , the more is the nuclear charge i.e. the number of protons , more will the force of attraction towards the nuclei and thus smaller will be the radii and vice versa.

Thus, order of decreasing ionic radii for the given ions is as follows.

$P^{3-}$ > $Cl^{-}$ > $K^{+}$ > $Ca^{2+}$

Answer from: Quest

1.consider the following balanced equation and answer parts a through. show calculations for each part.

3 ag(s) + 4 hno3(aq) → 3 agno3(aq) + no(g) + 2 h2o(l)

a. calculate the number of moles of agno3 produced by the reaction of 3 moles of ag with excess hno3. if the number to the left of the compound represents the number of moles of the compound which are present, then 3 moles of ag react with 4 moles hno3 to produce 3 moles agno3 (aq).

so the answer to a would be 3 moles.

b. calculate the number of moles of agno3 produced by the reaction of 108 grams of ag with excess hno3.

i'm not sure how to plug in the grams of silver into an equation using moles to find how many moles are produced.

c. calculate the number of grams of agno3 produced by the reaction of 108 grams of ag with excess hno3

d. calculate the number of moles of no produced as a byproduct of the reaction of 108 grams of ag with excess hno3.

e. calculate the number of grams of no produced as a byproduct starting with 108 grams of ag and excess hno3.

explanation:

Answer from: Quest

a is the answer to this question

explanation:

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What is the correct order of decreasing size of the following ions? multiple choice ca2+ > k+ &...