science quiz Flashcards
what the number 1 thing about atoms
they are the building blocks of matter
protons
positively charged - found in the nucleus
neutrons
no charge - found in nucleus
electrons
negative - orbits nucleus in electron shells
nucleus
contains protons and neutrons - central part of atom - small compared to size of atom
electron shells
electrons orbit around the nucleus organized into electron shells - each shell contains a specific number of electrons
atomic number
the number of protons in and atom - defining its identity
atomic mass
the sum of protons and neutrons in and atom
how do you find the number of neutrons in and atom
atomic mass - atomic number = number of neutrons
what is the same number when the atom is neutral
electrons and protons
elements
atoms with the same number of protons
isotopes
atoms of the same element with different numbers of neutrons
whats the definition of periodic table
a tabular arrangement of chemical elements organized based of their increasing atomic number, electron configuration, and recurring chemical properties
what is another name for rows
periods
what is another name for columns
groups and families
elements in the same group have similar…
chemical properties
elements in the same group have the same…
number of electron shells
atomic mass is usually given in..
atomic mass units
AMU stands for
atomic mass unit ( standard weight of elements )
electron configuration
describes how electrons are distributed in an atoms electron shells - follows a pattern
elements in the same group have similar
chemical propreties
common groups
alkali metals / alkaline earth metals / halogens / noble gases
elements in the same period have
the same number of electron shells
metals
located of the left - good conductors of heat and electricity
