8th Grade Science Chemistry 2
Terms in this set (11)
The average mass of all the isotopes of an element
The number of protons in the nucleus. It is located at the top of each element square on the periodic table.
Electrons that exist in the outermost shell of an atom. Valence electrons can be gained or lost in a chemical reaction.
An atom that loses or gains electrons to become positively or negatively charged.
The combination of protons and neutrons of an atom that has an overall POSITIVE charge.
Periodic Table of Elements
A table showing all the known elements. The elements are grouped based on similar properties (ie metals, non-metals, non-reactive gases)
an abbreviation or short representation of a chemical element; the symbols in the periodic table. Natural elements all have symbols of one or two letters. Some man made elements have symbols consisting of three letters.
made of the chemical symbol as well as the number of each type of atom shown in subscripts
Subatomic particles found in the nucleus with a positive charge.
Subatomic particles found in the nucleus with a neutral charge
Subatomic particles found in orbitals surrounding the nucleus with a negative charge.
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