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Chapter 4 vocabulary #1

Across
Group 2A Earth Metals
Elements of group 1A (10 except for hydrogen. Soft, shiny metals
An abbreviation used to indicate the mass number and atomic number of an isotope
A small mass unit used to describe the mass of very small particles such as atoms and subatomic particles. 1 amu is equal to one-twelfth the mass of a carbon-12 atom
A negatively charged subatomic particle having a very small mass that is usually ignored in mass calculations
Down
An abbreviation that represents the name of an element.
A number that is equal to the number of protons in an atom
The weighted average mass of all the naturally occurring isotopes of an element
The smallest particle of an element that retains the characteristics of the element
An abbreviation that represents the name of an element