Atoms I
Atoms II
Organizing the Elements
Metals, Non-metals and Metalloids
Radioactive Elements
100
The positively charged particle in an atom.
What is a proton?
100
The negatively charged particle in an atom.
What is an electron?
100
A chart used to organize all the known elements.
What is the periodic table?
100
The ability to be hammered into different shapes
What is malleability?
100
A fast-moving electron given off by a nucleus during radioactive decay
What is a beta particle?
200
The number of protons of an atom of an element.
What is atomic number?
200
Where almost all the mass of an atom is found.
What is the nucleus?
200
The characteristic of an element's atoms that is used to organize the periodic table.
What is atomic number?
200
The ability to transfer heat energy
What is thermal conductivity?
200
A particle given off by a nucleus during radioactive decay that consists of 2 protons and 2 neutrons
What is an alpha particle?
300
The average mass of all the isotopes of an element.
What is atomic mass?
300
The number of protons plus the number of neutrons of an atom.
What is mass number?
300
Part of the periodic table that contains elements that have similar properties.
What is a group (or family)?
300

Elements that have properties that are in-between those of metals and non-metals.

What are metalloids?

300
The highest energy form of radiation
What are gamma rays?
400
Because atoms are too small to study directly, scientist created these to help describe them.
What are models?
400
Atoms of an element having different numbers of neutrons.
What is an isotope?
400
Parts of the periodic table where the properties of the element change in a repeating pattern.
What are periods?
400
The ability to be drawn into a wire.
What is ductility?
400
The length of time it takes for half the atoms of a sample of a radioactive isotope to decay.
What is half-life?
500
His experiment shooting positively charged particles through gold foil changed the model of an atom to include a positively charged nucleus at the center.
Who is Rutherford?
500
The model of an atom that suggested that electrons move in specific orbits around the nucleus of the atom.
What is Bohr's model?
500
His periodic table was arranged by atomic mass.
Who is Mendeleev?
500

This metalloid is important for the production of computer chips. It is the second most abundant element on Earth, after oxygen.

Silicon

500
The person who named the property of an atom of spontaneously emitting radiation as radioactivity
Who is Marie Curie?
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