Which one of the following explains why iodine is less reactive than chlorine?• The outer electrons in iodine are further from the nucleus and are shielded by more inner shells of electrons.• This means there is a weaker attraction between the positively charged nucleus and the negatively charged outer electrons.• This makes it harder for iodine to attract another outer electron than chlorine.• The outer electrons in chlorine are further away from the nucleus and are shielded by more inner shells of electrons.• This means there is a weaker attraction between the positively charged nucleus and the negatively charged outer electrons.• This makes it easier for chlorine to attract another outer electron than iodine.• The outer electrons in iodine are closer to the nucleus and are shielded by fewer shells of electrons.• This means there is a weaker attraction between the positively charged nucleus and the negatively charged outer electrons.• This makes it easier for iodine to gain an outer electron than chlorine.

Chlorine and iodine undergo similar reactions.Which one of the following explains why chlorine and iodine react similarly?Chlorine and iodine both have the same relative atomic mass. The relative atomic mass determines how atoms will react.Chlorine and iodine both have the same atomic number. The atomic number determines how atoms will react.Chlorine and iodine both have 7 protons on their outer shell. The number of protons on the outer shell determines how atoms will react.Chlorine and iodine both have 7 electrons on their outer shell. The number of electrons on the outer shell determines how atoms will react.

Suppose the formation of iodine proceeds by the following mechanism:step elementary reaction rate constant1 H2(g) + ICl(g) → HI(g) + HCl(g) k12 HI(g) + ICl(g) → I2(g) + HCl(g) k2Suppose also k1≫k2. That is, the first step is much faster than the second.Write the balanced chemical equation for the overall chemical reaction: Write the experimentally-observable rate law for the overall chemical reaction. =ratek Note: your answer should not contain the concentrations of any intermediates.Express the rate constant k for the overall chemical reaction in terms of k1, k2, and (if necessary) the rate constants k-1 and k-2 for the reverse of the two elementary reactions in the mechanism. =k

b) Chlorine reacts with aqueous potassium iodide in a displacement reaction.Cl2 (aq) + 2I– (aq) 2Cl – (aq) + I2 (aq)(i) Explain, in terms of electrons, why chlorine is an oxidising agent in this reaction................................................................................................................................................................................................................................................................................. [1](ii) State the oxidation number of iodine in I2 .

Which one of the following explains why lithium is less reactive than sodium?• The outer electron in sodium is closer to the nucleus and is shielded by fewer inner shells of electrons.• This means there is a stronger attraction between the positively charged nucleus and the negatively charged outer electron.• This makes it harder for sodium to lose its outer electron compared to lithium.• The outer electron in lithium is closer to the nucleus and is shielded by fewer inner shells of electrons.• This means there is a stronger attraction between the positively charged nucleus and the negatively charged outer electron.• This makes it harder for lithium to lose its outer electron compared to sodium.• The outer electron in lithium is further away from the nucleus and is shielded by more inner shells of electrons.• This means there is a weaker attraction between the positively charged nucleus and the negatively charged outer electron.• This makes it easier for lithium to lose its outer electron compared to sodium.I DON'T KNOWSUBMIT ANSWER

Which one of the following explains why potassium is more reactive than lithium?• The outer electron in potassium is closer to the nucleus and is shielded by fewer inner shells of electrons.•This means there is a stronger attraction between the positively charged nucleus and the negatively charged outer electron.•This makes it easier for potassium to lose its outer electron compared to lithium.• The outer electron in potassium is further away from the nucleus and is shielded by more inner shells of electrons.• This means there is a weaker attraction between the positively charged nucleus and the negatively charged outer electron.• This makes it easier for potassium to lose its outer electron compared to lithium.• The outer electron in lithium is further away from the nucleus and is shielded by more inner shells of electrons.• This means there is a weaker attraction between the positively charged nucleus and the negatively charged outer electron.• This makes it easier for lithium to lose its outer electron compared to potassium.