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Atoms
elements
Periodic table
Metals
Nonmetals
100
What type of charge does an electron have
What is negative
100
The number of protons in the nucleus of an atom is the _________________ of that atom's element.
What is atomic number
100
Many periodic tables include a zigzag line that separates, the metals from the nonmetals called
What is metalloids
100
the ability of an object to transfer heat
What is thermal conductivity
100
These metals are poor conductors of electric current and heat. They tend to be dull and brittle.
What is a nonmetal
200
What type of charge does a proton have
What is positive
200
Atoms with the same number of protons but different number s of neutrons are called
What is isotopes
200
How can you predict an elements properties?
What is location on the periodic table
200
Most metals are _____at room temperature
What is solids
200
Many nonmetals are _______at room temperature.
What is gases
300
In Rutherford's gold foil experiment, most positively charged particles passed through the foil, but a few particles were deflected strongly. This result caused Rutherford to infer
What is an atom's positive charge must be clustered in a tiny region in its center.
300
Who created the periodic table?
What is Mendeleev
300
The periodic table is arranged in rows called
What is periods
300
The metals of Group 1 are called______. These metals are so reactive that they are never found as uncombined elements in nature.
What is alkali metals
300
Name the halogen nonmetals?
What is Fluorine, Chlorine, bromine and iodine
400
In this model the orbits look like planets orbiting the sun or layers of an onion
What is Bohr's model
400
How did Mendeleev arrange the first periodic table
What is atomic mass
400
Another name for groups is
What is family
400
These metals are called ______. They are harder and denser, and melt at higher temperatures than the alkali metals.
What is alkaline earth metals
400
A radioactive isotope is the length of time needed for half of the atoms of a sample to decay
What is half life
500
At the center of the atom is a tiny, dense _________ containing protons and neutrons.
What is a nucleus
500
What information does the periodic table contain?
What is atomic number, chemical symbol and atomic mass
500
These are elements that are good conductors of electric current and heat, they are shiny, and bendable. The majority of the periodic table are these
What is metals
500
name the two most common alkaline earth metals
What is calcium and magnesium