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Chapter 4 Key Words

Across
The distance between the nucleus and the outermost electrons.
The weighted average mass of all the naturally occurring isotopes of an element.
The compact, extremely dense center of an atom that consists all the protons and neutrons.
The total number of protons and neutrons in the nucleus of an atom.
A vertical column of elements on the periodic table.
A negatively charged subatomic particle.
An element in the tall columns on the periodic table (groups 1A to 8A).
An element with little or no luster that is a poor conductor of heat and electricity.
A measure of how easily an element loses an electron.
Electrons in the highest energy level (outermost shell) of a atom.
The smallest particle of an element that retains the characteristics of the element.
An element in group 7A.
An element in group 1A (except H)
Down
An element that is shiny, malleable, ductile and a good conductor of heat and electricity.
The energy needed to remove the least tightly bound electron from the outermost energy level of an atom.
A neutral subatomic particle with mass of about 1 amu.
An element in group 2A.
A number equal to the number of protons in the nucleus of an atom
Elements with properties of both metals and nonmetals.
A horizontal row of elements on the periodic table.
A group of electrons with similar energy.
An atom that differs only in mass number from another atom of the same element.
A group of orbitals of equal energy within an energy level.
An element in group 8A, generally unreactive.
A positively charged subatomic particle found in the nucleus.
The region around the nucleus where electrons of a certain energy are likely to be found.