Periodic Table Flashcards
who was the creator of the periodic table
demirri mendaleev
what is an atomic number
it is the number of protons and neutrons inside the nucleus
what is the total number of protons and neutrons referred to as
Mass number
what is a valeence shell
it is the outer most layer on an atom
how many synthetic elements are there
there are 25 synthetic elements
what are the three classes elements are divided into
metals non mentals and metalloids
what are metals and where on the periodic table are they found and what is an example
Metals are usually solids and are good conductors of heat they are located on the left side of the periodic table ( all metals are solid except mercury) an example is aluluminium
what are non metals where on the periodic table are they found what is an example
no metals can either be solids liquid or gas they are poor conductors of heat they are located on the left side of the periodic table and example is chlorine
what are metalioids where are they found and an exmaple
mettaloids are between metals and no metals they form the stair case an example is silicone
what are the four main groups you need to remmebr
group one alkali metals
group two alkaline earth metals
group 17 halogens
group 18 nobel gasses
what are teh sub atomic particles
electrons neutrons and protons
what do electrons take most of
they take most of the volume of an atom
where do electrons have the most and least energy
electrons closes to the neculles have the lowest energy
electrons furthest have the most energy
