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subatomic particles
vocabulary
speed reading
organization of periodic table
potpourri
100
particle with positive charge
proton
100
basic building block of all matter in the universe
atom
100
chemical symbol for carbon
C
100
number at the top of each box
atomic number
100
name of current model of the atom
electron cloud model
200
particle most like the proton
neutron
200
elements in the same column on the periodic table
family or group
200
number of energy levels in an atom of lithium (Li)
two
200
category of elements on the left side of periodic table
metals
200
If the charge on a proton is positive, what is the charge on a neutron?
neutral
300
particle that is not in the nucleus
electron
300
electrons in the outside energy level
valence electrons
300
number of valence electrons in an atom of neon
eight
300
elements that border the zig zag line that are not quite metals and not quite non-metals
metalloids or semi-metals
300
Who is the "father of the periodic table"?
Mendeleev
400
particle whose number in the atom is the atom's identity
proton
400
smallest particles known; make up protons and neutrons
quarks
400
name of element whose chemical symbol is W
tungsten
400
characteristic for all elements in the same row
same number of energy levels
400
only element that is a liquid at room temperature
mercury
500
Why do we say that electrons do not add to the mass of the atom?
Because they are so much smaller than the proton and neutron that their mass is insignificant and doesn't affect the total mass of the atom.
500
How many valence electrons does palladium have?
zero
500
atomic number for arsenic
33
500
Which is more important for an element's properties - its period or its family/group? Explain your answer.
The element's family. All elements in the same family have the same number of valence electrons. The valance electrons will determine how the element reacts with other elements.
500
Why won't the big gap at the top of the periodic table ever be filled in?
There are no missing atomic numbers - the gap is there to correctly arrange the periods and families/groups.