正负值第一却默默无闻（正负值榜首，却鲜为人知）

Deciphering a riddle

I’m looking at the user’s input, which is a Chinese phrase that seems to be a riddle: "正负值第一却默默无闻." It suggests something that is number one in positive and negative values but is little known. I’m considering if this means zero, since it fits as neither positive nor negative, and could be seen as first when sorting numbers. "却默默无闻" implies it’s not commonly recognized. So, I think zero could be the answer here!Analyzing a riddle about elements

I’m thinking about another riddle that discusses "正负值第一." It might hint at the first in positive and negative values, possibly relating to +1 or -1. The phrase "默默无闻" suggests something silent, like hydrogen, which is abundant yet colorless, odorless, and tasteless. It fits because hydrogen could be seen as having both a +1 and -1 valence. This connection makes sense and could point towards hydrogen being the answer for this riddle!Deciphering the valence riddle

I’m realizing that hydrogen has a valence of +1 or -1, which makes it the first element in the periodic table. The phrase "正负值第一” hints at this valency, while "却默默无闻" relates to hydrogen being silent and odorless. The wordplay is interesting: it suggests something that has no smell and is indeed quiet, which really fits hydrogen. So, the answer to the riddle is likely "氢" (Hydrogen). I'll keep it concise and clear!Providing a concise answer

I’m aiming for a final, concise answer in a bullet style. The answer is "氢 (H/H2)" with a brief explanation:

• First element in the periodic table.
• Valence can be +1 or -1.
• The gas is colorless, odorless, and silent, which aligns with "默默无闻" as a pun.

I’ll keep this minimal and clear for easy understanding!