mendeleevs periodic table\/

in order of increasing relative atomic mass

how were the elements arranged

the mean mass of all the different isotopes in an element

what is relative atomic mass

elements with similar properties were below each other in groups

how did the properties impact the way the elements were ordered

by using the chemical and physical properties of of the elements next to the gap

how did he predict the elements

iodine has a lower atomic mass so it should have been before tellurium but as it had similar chemical properties to chlorine and bromine he swapped iodine and tellurium. also because of the existance of isotopes

why was iodine and tellurium swapped

the amount of protons in an atom

what is the atomic number

atomic number

what is the periodic table arragnged in now

periods

what are the horizontal rows called

groups

what are the verticle collums called

they have similar properties

what do the groups have in common

on the left

where are metals found

on thr right

where are non metals found

it is an atom of an element with the same amount of protons and electrons but different number of neutrons

what are isotopes