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PS Ch 4-5 Terms

Name:  _______________________________
Date:__________________Pd:____________
Across
An atom of an element that has the same number of protons but a different number of neutrons relative to other atoms of the same element
An element that conducts heat and electricity poorly, example: oxygen, chlorine, argon
The max number of electrons the third orbital can hold
Semiconductors, found in Groups 13-17, have characteristics of both metals and nonmetals, includes Tellurium
A unit or quantum of light
The scientist who said atoms of a given element were exactly alike, and atoms of different elements could combine to form compounds
The positively charged central part of the nucleus
Isotopes that emit radiation and decay into other isotopes
The SI base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms of carbon in exactly 12g of C-12
The max number of electrons the second orbital can hold
6.022 x 10^23 particles
Elements of Group 17, most reactive of the groups, have seven valence electrons
The scientist who conducted the cathode-ray tube experiment, discovered electrons, and developed the plum-pudding model
Metals found in Groups 3-12, includes gold and silver
The scientist who first identified the possibility of the atom
Scientist who created the foundations for the periodic table
Down
A region in an atom where there is a high probability of finding electrons
Elements found in Group 18, nonreactive, often used in light making
A subatomic particle that has a negative charge and is found in the orbitals
A subatomic particle that has no charge and is located in the atom's nucleus
Metals found in group 2. They are harder, denser, and stronger than the Alkali metals
A positively charged particle in the nucleus of an atom
Electrons found in the outer shell, all elements of the same period have the same number
The max number of electrons the first orbital can hold
The number of protons in the nucleus of an atom
The max number of electrons the fourth orbital can hold
The scientist who proposed that most of the mass of the atom was concentrated at the atom's center, conducted the gold-foil experiment
Metals found in Group 1, soft and shiny, react violently with water
The sum of the numbers of protons and neutrons in the nucleus of an atom, the rounded mass
An element that is shiny and conducts heat and electricity well, commonly found on the left side of the periodic table