CC4 - Periodic Table

1.13 In the 1869 Mendeleev organised th periodic table the 63 discovered elements by their.......

• Relative atomic mass
• atomic number
• number of valence electrons
• number of isotopes

1.13 Mendeleev did not always arrange the elements by relative atomic mass, he sometimes....

• arranged by atomic number
• arranged them alphabetically
• arranged them by their chemical properties
• arranged them randomly 

1.14 What did Mendeleev do in his periodic table that allowed him to predict properties of undiscovered elements?

• he filled in gaps with made up elements
• he left out some elements he knew about 
• he left gaps 
• he did not leave gaps

1.14  Mendeleev arranged elements in vertical columns by their...

• increasing atomic number
• number of neutrons in the element
• increasing atomic mass
• decreasing atomic mass

1.14 Mendeleev arranged elements in rows by their....

• similar number of protons
• similar number of electrons
• similar chemical properties
• alphabetically 

1.15 Mendeleev's arrangement of atoms by their relative atomic mass was not always correct because of.....

• the incorrect atomic numbers 
• the existence of different atoms
• the existence of isotopes
• the incorrect structure of an atom

1.15 Atomic masses on the periodic table are calculated by the mean relative atomic mass of....

• all the elements on the periodic table
• similar elements 
• isotopes of the same element
• isotopes of different elements

1.16 Atomic number is the....

• number of protons in an atom
• number of neutrons in an atom
• number of protons and neutrons in an atom
• number of atoms in a row

1.16 Elements in a row are arranged by...

• increasing atomic mass
• alphabetically
• no pattern
• increasing atomic number

1.17 Rows are arranged by...

• increasing atomic number
• increasing atomic mass
• increasing atomic mass and number
• name of the element