21) oxygen______symbols: p ag zn c cl
22) phosphorus______
23) silver______
24) chromium______
25) argon______
26) zirconium______symbols: k zr he ba au
27) hydrogen______
28) gold______
29) helium______
30) barium______
31) lithium______symbols: rb cl zn fe u
32) chlorine______
33) zinc:______
34) iron______
35) rubidium______
36) nitrogen______symbols: k br co i c si n hg
37) potassium______
38) bromine______
39) mercury______
40) cobalt______
41) iodine______
42) carbon______
43) silicon______

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Accepted Answer

# Brief Explanations:
This problem involves matching the names of chemical elements with their standard chemical symbols. It is based on the knowledge of the periodic table and common chemical symbol notations. For example, "Oxygen" is commonly known to have the symbol "O", "Silver" is "Ag" (from its Latin name Argentum), etc. Each element - symbol pair is a fundamental piece of chemical nomenclature.
# Answer:
21) Oxygen - O
22) Phosphorus - P
23) Silver - Ag
24) Chromium - Cr
25) Argon - Ar
26) Potassium - K
27) Hydrogen - H
28) Gold - Au
29) Helium - He
30) Barium - Ba
31) Lithium - Li
32) Chlorine - Cl
33) Zinc - Zn
34) Iron - Fe
35) Rubidium - Rb
36) Nitrogen - N
37) Potassium - K
38) Bromine - Br
39) Mercury - Hg
40) Cobalt - Co
41) Iodine - I
42) Carbon - C
43) Silicon - Si

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