biology

Anything that has mass and occupies space.

• Matter

• Energy

• Element

• Compound

Substances made up of only one type of atom.

• Isotope

• Element

• Compound

• Ion

Substances formed by the chemical combination of two or more different elements.

• Molecule

• Atom

• Compound

• Particle

Essential chemical elements required for the structure and function of living organisms, like carbon, hydrogen, oxygen, and nitrogen.

• Elemental Elements

• Organic Elements

• Life Elements

• Elements in Life

Elements needed in very small amounts by living organisms, such as iron, zinc, and copper.

• Minor Elements

• Trivial Elements

• Trace Elements

• Micro Elements

Tiny particles that make up atoms, including protons, neutrons, and electrons.

• Atomic Particles

• Microscopic Particles

• Subatomic Particles

• Nano Particles

Positively charged subatomic particles found in the nucleus of an atom.

• Electrons

• Protons

• Positrons

• Neutrons

Neutrally charged subatomic particles found in the nucleus of an atom.

• Electrons

• Positrons

• Protons

• Neutrons

Negatively charged subatomic particles found in electron shells outside the nucleus.

• Electrons

• Neutrons

• Protons

• Photons

Number of protons in an atom's nucleus, which determines the element's identity.

• Proton Number

• Element Number

• Atomic Number

• Mass Number