chemics

-electrode is divided into positive and negative

-when electrolysis happens they decompose water to oxygen and hydrogen- positive electrolysis makes hydrogen and negative makes oxygen

-ratio of substances when electrolysis happens is 2:1 there is more hydrogen

-numbers in substances mark the ratio in compounds

-when you burn oxygen and hydrogen combustion happens and it makes H2O and energy

-elements that conduct electric current and are malleable are copper, nickel , cobalt and gold

-sodium, potassium, magnesium and calcium  are elements that are used for medical things and these are alkaline metals

-halogens are nonmetals, they don’t conduct electric current and they are strong

-in halogens the abbreviation end on OH

-in oxyds the abbreviation end in O

-in oxalic acids starts with H and end in O

-in non-oxalic acids start with H and end in L

-a group in one column numbered in roman numbers 

-he knew that we didn't know some elements because of the properties and atomic mass