5 Questions
What is the approximate percentage of oxygen in the Earth's crust?
46%
What are isotopes?
Different forms of an element with the same number of protons but different number of neutrons.
What are the two regions that compose an atom?
Nucleus and orbitals
Which element constitutes approximately 10% of living organisms (humans)?
Hydrogen (H)
What are elements?
Unique forms of matter with specific chemical and physical properties that cannot be broken down into smaller substances by ordinary chemical reactions.
Test your knowledge about the basic units of matter and elements that make up living organisms. Explore the percentage of elements in humans compared to the non-living world.
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