Test 1 2 Flashcards
What came up with the the periodic table
Mendeleev in 1869 containing 63 known electrons
What did Mendeleev arrange elements in
In order of atom weight
What did Mendeleev do to the elements
He swapped around some elements so the elements with similar chemical properties were in the same group
What did he leave gaps for
Undiscovered elements eg gallium and germanium and he predicted their properties
What is the verticals columns called
Groups
What is the horizontal rows called
Period
What is elements arranged in
Atomic number
What is group one called
Alkali metal
What is the middle block of elements called
Transition metals
What is group 7 called
Halogens
What is group 0called
Noble gases
Within ten years what happened
Gallium and germanium were discovered and there properties matched Mendeleev predictions so the periodic table was accepted
