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Ch 3 - All Lessons 1-5
Terms in this set (40)
the smallest particle that can still be considered an element
negatively charged particle
the small region within an atom that holds positive charge
positively charged particles
the specific amount of energy that an electron has, has to do with distance from nucleus
a particle in the nucleus with no charge
the number of protons in an element's nucleus
an atom with the same number of protons, but a different number of neutrons than most atoms of that element
the sum of the protons and neutrons in the atom
the average mass of all the isotopes of that element
an arrangement of elements showing the repeating patterns of their properties.
abbreviation containing one or two letters that represents an element
contains a series that follows a pattern, yet elements next to each other share very little similarities.
contains a family of elements that have similar properties and react in similar ways.
Elements that are good conductors of electric current and heat.
Shiny and reflective
Can be hammered or rolled into flat sheets
Can be pulled out, or drawn out, into long wires
Ability of an object to transfer heat
Ability of an object to carry electric current
The ease and speed with which an element combines/reacts with other substances
Deterioration of a metal due to a chemical reaction in the environment
Most reactive elements in the periodic table. Never found as pure elements in nature. Gr 1
Less reactive than other metals, largest group of metals on periodic table. Gr 3 - 12
alkaline earth metal
Harder and denser, not as reactive, but still never found as pure elements in nature. Gr 2
Element that lacks most of the properties of a metal. Most are poor conductors, dull, and brittle.
Made up of two atoms.
Non-metals that are very reactive. Name means "salt forming"
Non-metals that do not form compounds and are usually nonreactive
Elements that have some properties of metals and some properties of non-metals. Always solids at room temperature.
Substances that conduct electric current under some conditions but not under other conditions.
The atomic nuclei of radioactive isotopes releases particles and energy. Changes identity of atom.
Reaction involving the particles in the nucleus of an atom
The ability to spontaneously emit radiation.
Emission of two protons and two neutrons. (+ charge)
Emission of fast moving electron given off by a nucleus, (Neutron turns into proton & electron, then emits the electron)
high energy rays that do not have charge.
Length of time needed for half of the atoms in a radioactive sample to decay.
Calculate how many half-lives have passed to estimate the age of something.
Radioactive Isotopes that can be followed through steps of a chemical reaction.
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