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Anatomy Test 1
Anatomy
Term | Definition |
---|---|
Matter | Anything that has mass and occupies space. |
Energy | Anything that moves or otherwise acts upon matter; two forms. |
Kinetic | Energy in motion. |
Potential | Energy at rest. This includes chemical energy which is stored in the bonds of molecules. |
Element | The simplest form of matter; cannot be broken down into two or more different substances; represented by chemical symbols. |
Atom | The smallest structural unit of an element that still retains its chemical and physical properties. |
Molecule | A substance composed of two or more atoms. |
Compound | A substance composed of two or more different elements. |
Nucleus | Dense core containing protons and neutrons. |
Protons | Positively charged particles. |
Neutrons | Neutral or non-charged particles. |
Electrons | Negatively charged particles. |
Energy levels/Shells | Space around the nucleus containing the electrons which travel in orbitals around the nucleus based on their energy levels. |
Atomic-number | Number of protons. |
All atoms of the same element, but no two different elements | Contain the same number of protons. |
Usually the number of neutrons | Equals the number of protons. |
Atomic mass | The collective number of protons and neutrons. |
Isotopes | Atoms of the same element with different atomic weights due to a differing number of neutrons. |
There can only be up to two electrons in | Each orbital |
The first shell only has | One orbital |
The second and third orbitals only have | Four orbitals |