Question

activity of the elements
since metals prefer to give away electrons during chemical bonding, the most active metals are closest to francium, which is a large atom with low ionization energy and electronegativity. nonmetals prefer to pull in electrons, so the most active nonmetals are closest to fluorine, which has a high ionization energy and electronegativity. the noble gases (group 18) are considered inactive since they already have a stable octet of electrons in their outer shell.
referring to a periodic table, circle the member of each pair of elements which is most chemically active.

1. li and na
2. cl₂ and f₂
3. n₂ and n
4. rb and ca
5. tl and ca
6. k and mg
7. o₂ and s
8. i₂ and br₂
9. na and zn
10. p and s
11. n₂ and o₂
12. cl₂ and ar
13. ba and fr
14. rb and cu
15. be and cr
16. cl₂ and br₂
17. xe and i₂
18. fe and ra
19. sr and mn
20. k and na
21. au and mg
22. s and rn
23. li and be
24. se and br₂
25. i₂ and f₂
26. rb and sr
27. ba and ra
28. na and mg
29. te and i₂
30. ca and rn

© carson - dellosa • cd - 104642

Explanation:

Step1: Recall metal activity trend

Metals' activity increases down a group and left - to - right across a period (for metals).

Step2: Recall non - metal activity trend

Non - metals' activity increases up a group and right - to - left across a period (for non - metals). Noble gases are inactive.

1. Na (Sodium is more active than Lithium as it is below Li in Group 1)
2. F₂ (Fluorine is more active than Chlorine as it is above Cl in Group 17)
3. N (Nitrogen atom is more reactive than N₂ molecule)
4. Rb (Rubidium is more active than Calcium as it is more metallic)
5. Ca (Calcium is more active than Thallium in terms of metallic activity)
6. K (Potassium is more active than Magnesium as it is more metallic)
7. O₂ (Oxygen is more reactive than Sulfur as it is above S in Group 16)
8. Br₂ (Bromine is more active than Iodine as it is above I in Group 17)
9. Na (Sodium is more active than Zinc as it is more metallic)
10. S (Sulfur is more active than Phosphorus as it is more non - metallic)
11. O₂ (Oxygen is more reactive than Nitrogen as it is more non - metallic)
12. Cl₂ (Chlorine is active while Argon is a noble gas and inactive)
13. Fr (Francium is the most active metal, more active than Barium)
14. Rb (Rubidium is more active than Copper as it is more metallic)
15. Cr (Chromium is more active than Beryllium in terms of metallic activity)
16. Cl₂ (Chlorine is more active than Bromine as it is above Br in Group 17)
17. I₂ (Iodine is active while Xenon is a noble gas and inactive)
18. Ra (Radium is more active than Iron as it is more metallic)
19. Sr (Strontium is more active than Manganese as it is more metallic)
20. K (Potassium is more active than Sodium as it is below Na in Group 1)
21. Mg (Magnesium is more active than Gold as it is more metallic)
22. S (Sulfur is active while Radon is a noble gas and inactive)
23. Li (Lithium is more active than Beryllium as it is more metallic)
24. Br₂ (Bromine is more active than Selenium as it is more non - metallic)
25. F₂ (Fluorine is the most active non - metal, more active than Iodine)
26. Rb (Rubidium is more active than Strontium as it is more metallic)
27. Ra (Radium is more active than Barium as it is below Ba in Group 2)
28. Na (Sodium is more active than Magnesium as it is more metallic)
29. I₂ (Iodine is more active than Tellurium as it is more non - metallic)
30. Ca (Calcium is active while Radon is a noble gas and inactive)

Answer:

1. Na
2. F₂
3. N
4. Rb
5. Ca
6. K
7. O₂
8. Br₂
9. Na
10. S
11. O₂
12. Cl₂
13. Fr
14. Rb
15. Cr
16. Cl₂
17. I₂
18. Ra
19. Sr
20. K
21. Mg
22. S
23. Li
24. Br₂
25. F₂
26. Rb
27. Ra
28. Na
29. I₂
30. Ca