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Introduction to atoms
organizing the elements
metals
Nonmetals and metalloids
Radioactive Elements
100
The smallest particle of an element.
What is an atom?
100
The average mass of all the isotopes of an element
What is the atomic mass?
100
A term use to describe a material that can be pulled out into a long wire.
What is a ductile?
100
is an element that lacks most of the properties of a metal
What is a nonmetal?
100
THe process in which the atomic nuclei of unstable isotopes release fast-moving-particals and energy.
What is radioactive decay?
200
The negatively charged particles that is found outside the nucleus of an atom.
What is an electron?
200
A chart of the elements showing the repeating pattern of their properties
What is a Periodic Table?
200
The ease and speed with which an element combines, or reacts with other elements and compounds.
What is reactivity?
200
a molecule consisting of two atoms
What is a diatomic molecule?
200
The spontaneous emission of radiation by an unstable atomic nucleus.
What is radioactive?
300
The central core of the atom
What is an Nucleus?
300
A horizontal row of elements in the periodic table
What is a Period?
300
An element in Group 1 of the periodic table.
What is a(n) alkali metal?
300
An element found in group 17of the periodic table
What is halogen?
300
A type of nuclear radiation consisting of two protons and two neutrons.
What is an alpha particle?
400
A positively charged particle that is an atom's nucleus
What is a proton?
400
One or two letter representation of an Element.
What is a(n) chemical symbol?
400
An element in Group 2 of the periodic table.
What is alkaline earth metal?
400
An element in group 18 of the periodic table
What is a noble gases?
400
A fast moving electron that is given off as nuclear radiation.
What is a(n) beta particle?
500
A region of an atom in which electrons of the same energy are likely to be found.
What is a energy level?
500
A gas like state of matter consisting of a mixture of free electrons and atoms that are stripped of their electrons.
What is a(n) Plasma?
500
One of the element in Group 3 though 12 of the periodic table.
What is transition metal?
500
An element that has some characteristics of both metals and nonmetals
What is a metalloid?
500
A type of nuclear radiation made of high-energy waves.
What is gamma radiation?