We have learned a few secondary periodicity trends, including (n) group and (n +

Question

We have learned a few secondary periodicity trends, including (n) group and (n + 10) group similarity, diagonal relationship, and knight’s move relationship. Use these trends for question 3 – 5.

3. Phosphorus forms an oxychloride of formula POCl3. Which transition metal is likely to form an oxychloride of matching formula?

4. The most stable oxide of Na is its peroxide, Na2O2. Which alkaline earth metal is also likely to form peroxide?

5. Which heavy element is similar to indium according to knight’s move relationship? (Here, “heavy” means heavier than indium.) What is the most stable oxidation state of this heavy element? What is the highest oxidation state of this heavy element?

Explanation / Answer

3. Phosphorus forms an oxychloride of formula POCl3. Which transition metal is likely to form an oxychloride of matching formula?

Vanadium, VOCl3

4. The most stable oxide of Na is its peroxide, Na2O2. Which alkaline earth metal is also likely to form peroxide?

Barium ;barium peroxide (BaO2)

5. Which heavy element is similar to indium according to knight’s move relationship? (Here, “heavy” means heavier than indium.) What is the most stable oxidation state of this heavy element? What is the highest oxidation state of this heavy element?

Cu(I) is similar to indium according to knight’s move relationship. The most stable oxidation state of this heavy element is +3. The highest oxidation state of this heavy element is +3

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