I define the identity of an element, represented by a number, unique to each substance. What am I?
Category: Science · Difficulty: expert
Hint: Think about what distinguishes one element from another on the periodic table.
Answer
Atomic number
Explanation
The atomic number indicates the number of protons in an atom's nucleus and defines the element's identity.
This is a expert science riddle — one of the harder riddles here. The answer is Atomic number.
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