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Unit 5 Vocabulary
Atom- the basic particle from which all elements are made
Theory-an unifying explanation for a broad range of hypotheses and observations
Electron- a tiny, negatively charged particle that moves around the outside of the nucleus of an
atom
Model-a representation of a complex object or process, used to help people understand a
concept that they cannot observe directly
Nucleus- the central core of an atom which contains protons and neutrons
Electron cloud- the region of an atom where electrons are likely found, surrounds the nucleus
Proton- small, positively charged particles that are found in the nucleus of an atom
Atomic mass unit- (amu) the SI unit used to express the masses of particles in atoms
Neutron-a small particle in the nucleus of the atom, with no electrical charge
Atomic number-the number of protons in the nucleus of an atom
Isotope-an atom with the same number of protons and a different number of neutrons from
other atoms of the same element
Mass number – the sum of protons and neutrons in the nucleus of an atom
Atomic mass- the average mass of all the isotopes of an element
UNIT 5 Vocabulary
1. Atom
2. Theory-an unifying explanation for a broad range of
hypotheses and observations
3. Electron
4. Model
5. Nucleus (#2)
6. Electron cloud- the region of an atom where electrons are
likely found, surrounds the nucleus
7. Proton
8. Atomic mass unit- (amu) the SI unit used to express the
masses of particles in atoms
9. Neutron
10. Atomic number
11. Isotope
12. Mass number
13. Atomic mass