periodic table Flashcards
1
Q
who made the modern day periodic table
A
Mendeleev
1
Q
Henry Moseley
A
suggested that arranging the elements in order of increasing atomic number instead of increasing atomic mass
2
Q
Groups
A
1 to 18 run left to right in vertical columns
3
Q
periods
A
1 to 7 run from top to bottom in horizontal rows
