1. False = arranged the elements into rows in order of increasing mass so that elements with similar properties were in the same column.
2. False they were called groups or families.
3. False = metalloids come after metals
4. True = The vertical columns in the periodic table are called Groups or Families and the horizontal rows are called Periods.
5. True = Elements with similar chemical properties are in the same group of elements.
6. Some of the properties of the elements can be predicted given their location in the periodic table.
7. atomic mass
8. order of increasing atomic number. The order generally coincides with increasing atomic mass.
9. chemical symbol
10. the right of an element with an atomic number 10.