Intro to Atoms
He discovered that there were negatively charged particles in an atom, which later became known as electrons.
Who is JJ Thomson?
The average mass of all the isotopes of an element.
What is atomic mass?
This type of property of metals include shininess, malleability, ductility, and conductivity.
What is a physical property?
An element that lacks most of the properties of a metal.
What is a nonmetal?
Spontaneous emission of radiation by an unstable atomic nucleus.
What is radioactivity?
Through his gold foil experiment, he found that atoms have a nucleus.
Who is Ernest Rutherford?
He published the first period table of elements.
Who is Dmitri Mendeleev?
The destruction of a metal through this process.
What is corrosion?
Elements that are "salt forming"
What are halogens?
Radioactive isotopes that can be followed through the steps of a chemical reaction or an industrial practice.
What are tracers?
Rutherford named these positively charged particles.
What are protons?
The table is organized in these horizontal rows.
What are periods?
Group 2 of the periodic table contain these metals.
What are alkaline earth metals?
These are usually unreactive and exist in small amounts in Earth's atmosphere.
What are noble gasses?
High energy waves, similar to X-rays, almost always accompanied by alpha and beta decay.
What is Gamma radiation?
James Chadwick discovered this electrically neutral particle.
What is a neutron?
Vertical columns in the periodic table.
What are groups?
Iron, copper, nickel, silver, and gold are called this.
What are transition metals?
Elements that are solid at room temperature, brittle, hard, and somewhat reactive.
What are metalloids?
*DAILY DOUBLE*
A fast-moving electron given off by a nucleus during radioactive decay.
What is a beta particle?
The number of protons in the nucleus of an atom, which identifies the element.
What is atomic number?
The 4 kinds of information that can be found in a square of the periodic table.
What are Element name, chemical symbol, atomic number, and atomic mass?
These metals are so reactive that they are never found as uncombined elements in nature.
What are alkali metals?
Substances that can conduct electricity under some conditions, but not under other conditions.
What are semiconductors?
A process where the atomic nuclei of unstable isotopes release fast-moving particles and energy.
What is radioactive decay?