What do scientists create to show scientific theories that they cannot observe directly?
Models! (Like Thomson, Rutherford, Bohr, and Cloud)
100
What can you predict about an element based on its placement on the periodic table?
Its properties
100
What is corrosion?
The deterioration of a metal due to a chemical reaction in the environment
100
What are most nonmetal elements at room temperature?
Gases!
100
What is the spontaneous emission of radiation by an unstable atomic nucleus? (hint it was discovered by Marie Curie)
Radioactivity
200
What is an atomic number?
The number of the protons in an atoms nucleus
200
What is a vertical column of elements on the Periodic Table of Elements called?
What are the horizontal rows of elements on the Periodic Table of Elements called?
Columns= groups or families
Rows= periods
200
What is conductivity?
The ability of an object to transfer heat or carry electric current
200
What side of the periodic table are nonmetals found on?
The right side
200
What is a half life?
the length of time needed for half the atoms in a sample to decay
300
Which model describes electrons as orbiting the nucleus? (Like planets around the sun)
Bohr's Model
300
What is the modern periodic table organized by?
Atomic Number
300
What are the three main properties that most metals have?
Malleable, Ductile, and can carry electric current
300
What elements do not normally form compounds?
Noble Gases
300
What are the three major forms of radiation produced by radioactive decay?
Alpha particles, Beta Particles, and Gama Rays
400
What did Ernest Rutherford learn from his gold foil experiment?
An atoms positive charge must be clustered in a tiny region in the center
400
How did Mendeleev organize the first periodic table and why?
He organized them by increasing atomic mass (he also left blank spaces for elements to be classified into later)
400
What are the two most common alkaline earth metals?
Calcium and Magnesium
400
What are some physical and chemical properties most nonmetals have?
Physical- usually poor conductors of heat and electricity; usually have lower densities than metals
Chemical- nonmetals usually share or gain electrons when they react with other atoms; many nonmetals form compounds with other nonmetals
400
What are Beta radiation particles identical to?
Electrons
500
What are isotopes?
Atoms with the same number of protons and different numbers of neutrons
500
What information is found about each element of the periodic table?
Atomic number, Chemical Symbol, Element Name, and Atomic Mass
500
What are the five groups metals are classified into? (Need all 5 for points)
Alkali Metals, Alkaline Earth Metals, Transition Metals, Metals in Mixed Groups, Lanthanides and Actinides
500
Where are the Carbon, Nitrogen, Oxygen, Halogen, Noble Gases, Hydrogen, and Metalloid families on the periodic table?
Must mark table
500
How do the measurements of half-life make radioactive isotopes useful?
Half life measurements are used to determine the age of rocks and fossils