chem Flashcards
(30 cards)
atom
smallest compontent of everything
element
an atom or a group of atoms but only one type
mixture
2 elements not chemically combine
compound
is 2 or more elemnts chemically combines
atomic number
the number of protons (electrons)
mass number
is the total number of protons and neurtons in the element
subatomic particle
smaller than an atom
nucleus
protons and neutrons
proton
is a positively charged subatomic particle
neutron
is a neutrally charged subatomic particle
electron
is a negativelt charged subatomic particle
where are electrons
they are in the outer shells (valency shells)
what is an isotype
the same type of element with a different number of neutrons
whats an ion
a charged element
what is a cation
is a postively charged ion mostly metals
what is an anion
a negatively charged ion usually non metals
most reactive group
group 1
most unreactive group
group 18
what is a noble gas
group 18 and they have a full outer shell
atom structure
nucleus - protons and neutrons
outer shells - electrons
periodic tables
periods - rows
groups - coloums
how are elements ordered
atomic number
elements in group have in common
valence electrons
what do elements in periods have in common
same number of shells
