Periodic Table Flashcards
(26 cards)
Periodic Table
An arrangement of elements in columns, based on a set of properties that repeat from row to row.
Mendeleev
A chemist who developed the periodic table and organized elements by their properties while leaving empty spaces for more elements to be discovered.
Element
A pure substance that cannot be broken down.
Period
A row going across the Periodic Table.
Group/Family
A column going up and down on the Periodic Table.
Periodic Law
The pattern of repeating properties down each group in the periodic table.
Chemical / Element Symbol
The pattern of repeating properties down each group in the Periodic Table.
Atomic Number
Number of protons in an element, atomic number is also equal to the number of electrons.
Atomic Mass
The number of protons and neutrons in the nucleus (center) of an element.
Conductor
A material that allows things to flow.
Metal
Elements that are good conductors of heat and electric currents.
Nonmetal
Elements that are bad conductors of heat and electric currents.
Metalloid
Elements with properties that fall between those of metals and nonmetals.
Noble Gas
Elements in group 18, stable and unreactive.
Proton
A particle with a positive charge, same amount as an atomic number, this particle identifies the element.
Neutron
A particle with a neutral charge, same amount as (atomic mass - atomic number).
Electron
A particle with a negative charge, same amount as atomic number.
Valence Electron
Electrons on the outermost shell.
Orbital / Shell / Energy Level
Outer boundary of an atom, mostly empty space, each shell starting from the first shell can hold:
1st shell - 2 electrons
2nd shell - 8 electrons
3rd shell - 18 electrons
4th shell - 32 electrons
Nucleus (in an atom)
The center of an atom that contains neutrons and protons and therefore most of the mass.
Chemical Bond
A force of attraction between atoms to make them more stable.
Ion
When atoms transfer electrons and become charged particles.
Ionic Bond
The force of attraction that holds together positive and negative ions, a transfer of electrons.
Covalent Bond
A force of attraction that holds together two atoms and shares electrons.
