Show:
Atoms
Elements
Metals
Non-Metals
Radioactive Elements
100
"This model" of an atom is a ball of positive charge with negatively charged electrons embedded in it.
What is The Thompson model?
100
An element's properties can be predicted from it's a. number of isotopes b. number of neutrons. c. atomic mass. d. location in the periodic table.
What is d. the location in the periodic table.
100
If a substance is "this," it can be pulled or drawn into a wire.
What is ductile?
100
A ____________ consists of two nonmetal atoms bonded together.
What is a diatomic molecule?
100
The spontaneous emission of radiation from an unstable atomic nucleus is called "this."
What is Radioactivity
200
A __________ is a positively charged particle in an atom's nucleus.
What is proton?
200
This person created the first periodic table.
Who is Dmitri Mendeleev.
200
Which of the following is not a characteristic of most metals? a. brittle b. ductile c. good conductor d. malleable
What is "A" brittle?
200
This family is a very reactive group of mostly nonmetals whose atoms gain or share one electron in chemical reactions.
What is Halogen.
200
Marie Curie discovered these two new elements when working with uranium.
What is polonium and radium?
300
This term refers to the number of protons in the nucleus of an atom.
What is it's atomic number?
300
These two rows of elements are shown separate at the bottom of the periodic table in order to keep the table a reasonable size.
What are the lanthanides and actinides?
300
A _________ has some of the properties of both metals and non metals.
What is a metalloid?
300
These are the three properties of transition metals.
What is hard, shiny, and a good conductor of heat and electricity. Some of examples of transition metals are gold and copper. Because of gold's shine, it is used in jewelry. Copper is used as a wire because it is a good conductor of electricity.
300
A radioactive isotope that can be followed through a chemical reaction or industrial process is called this.
What is a Tracer?
400
The particles that are lost, gained or shared in a chemical reactions are these.
What are electrons?
400
From left to right in the periodic table, the elements are arranged in order of (decreasing or increasing) atomic number.
What is increasing?
400
This family of metals is the most the most reactive group of metals in the periodic table.
What is the alkali metals family
400
This is what happened in Rutherford's gold foil experiment, and why it was a significant development in of the atomic model.
What is in the gold foil experiment most of the positively charged particle passed through the foil undisturbed, but a few were strongly deflected.The results led Rutherford to suggest that the bulk of positive charge of an atom was located in the center called the nucleus.
400
These are radioactive isotopes that can be followed through the steps of a chemical reaction or an industrial process.
What are tracers.
500
The number of neutrons in a nucleus is found by subtracting these two numbers.
What is the atomic mass and atomic number.
500
The reactivity of metal elements generally (increases or decreases) as you move from left to right across the periodic table.
What is decreases?
500
Metals are good conductors of electricity and this.
What is heat?
500
This information can be found in a square of the periodic table and this is what it means.
What is 1. Atomic number: the number of protons 2. The chemical symbol which is usually a one or two letter symbol for the element. 3. the name of the element. 4. The atomic mass-which the average mass for all the isotopes of the element.
500
In the use radiation thereapy, radioactive elements are used to destroy these.
What are unhealthy cells or cancer cells.