What are the subatomic particles?
protons, neutrons, and electrons
the number of protons in the nucleus of an atom
Why are atoms electrically neutral?
the number of protons equals the number of electrons
What is the Charge, mass and location of a proton?
What is the Charge, mass and location of a neutron?
What is the Charge, mass and location of an electron?
How did Mendeleev organize the first periodic table of elements?
in order of increasing atomic mass
How are the elements arranged in the modern periodic table?
in order of increasing atomic number from left to right and top to bottom
What are columns in the periodic table called?
groups of families
What do elements in the same family or group have in common?
same number of valence electrons
the state or quality of shining by reflecting light
a term used to describe material that can be pounded into shapes
the properties of attracting to a magnet
the ability of an object to transfer electric current
a term used to describe a material that can be pulled oout into a long wire
What are the three categories of elements on the periodic table?
metal, nonmetal, semi metal
What is the family name for group 1 elements?
What is the family name for group 2 elements?
alkaline earth metals
What is the family name for group 17 elements?
What is the family name for group 18 elements?
What is the most reactive group of metals?
What is the most reactive group of nonmetals?
What are the two most common alkali metals?
What are the two most common alkaline earth metals?
Which group of elements do not ordinarily form compounds?
Inert gases/ group 18
What is the most useful property of semi metals?
What happens during radioactive decay?
the atomic nuclei of unstable isotopes release fast moving particles and energy called radiation
horizontal rows on the periodic table
a one or two letter representation of an element
In which state of matter are most nonmetals?
a material that conducts current under certain conditions
What happens to the reactivity of metals as you move from left to right across the periodic table?
Atomic number equals the number of_____
Atomic mass equals the number of___+___
The number of electrons equals the number of___
Properties of Alkali metals
very reactive, very soft, never found uncombined in nature, shiny, malleable, react violently with water
What is the name of the elements in groups 3-12?
an atom with the same number of protons and a different number of neutrons from other atoms of the same element
What are the seven diatomic particles?
Hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine
What can you predict from an elements location on the periodic table?
Which part of an atom makes up most of its atomic mass?
Which part of an atom makes up most of its volume?
What do elements in the same period have in common?
same number of energy levels
What part of an isotope increases as you go left to right?