Atoms, Ions, and Molecules: The Building Blocks of Living Things
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Vocabulary flashcards covering key terms from pages 3–5 about atoms, ions, molecules, and related concepts.
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15 Terms
Element
Chemical substance made of only one type of atom.
Atom
Smallest unit of an element; electrically neutral.
Nucleus
Center of the atom composed of protons and neutrons.
Proton
Positive charge (+1) particle in the nucleus.
Neutron
Neutral charge particle in the nucleus.
Electron
Negatively charged particle orbiting the nucleus (−1).
Atomic number
Number of protons in an atom's nucleus.
Mass number
Sum of protons and neutrons in an atom.
Hydrogen
One of the four elements that make up about 96% of matter in organisms.
Carbon
One of the four elements that make up about 96% of matter in organisms.
Nitrogen
One of the four elements that make up about 96% of matter in organisms.
Oxygen
One of the four elements that make up about 96% of matter in organisms.
Water
A simple molecule mentioned as a building block of chemical evolution.
Carbon dioxide
A simple molecule mentioned as a building block of chemical evolution.
Molecule
Two or more atoms bonded together.
Note 
Flashcards (103)