Multiple choice

Which of the following is an element?

  1. Water

  2. stean

  3. snow

  4. iron
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An element is a substance consisting of atoms which all have the same number of protons - i.e. the same atomic number. Elements are chemically the simplest substances and hence cannot be broken down using chemical methods. Elements can only be changed into other elements using nuclear methods.

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