Worksheetsattempts of elements classification 1
Total questions: 6
Worksheet time: 3mins
--- left gaps in his table predicting the discovery of new elements.
Mendelvee
Mosely
Rutherford
Bohr
Rutherford had to put more than one element in one cell
as iron, cobalt and nickel.
True
False
one of the Mendeleev's periodic table disadvantage -------------
he had to deal with the isotopes of one element
as different elements.
he corrected the atomic weights of some elements
which were wrong.
he left gaps in his table predicting the discovery of new elements.
--- discovered after studying x-rays
that the properties of elements are
related to their atomic numbers and
not their atomic weights.
Bohr
Mendeleev
Rutherford
Mosely
Rutherford specified a place below the table for lanthanides and actinides elements
True
False
Rutherford ---------------
added zero group that includes noble gases ,and the other elements that were discovered after Mendeleev’s periodic table.
discovered that the nucleus of the atom
contains positively charged protons .
corrected the atomic weights of some elements
which were wrong.
