Multiple choice

Properties of elements are determined by _____.

  1. atomic number

  2. atomic weight

  3. neutrons

  4. protons

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A Correct answer
Explanation

An element is defined by the number of protons in the nucleus of its atoms, but its chemical reactivity is determined by the number of electrons in its outer shell property fundamental to the organization of the periodic table of the elements. So, atomic number is good to defined the different properties of the elements.

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