Chapter 3 Periodic Table
mendeleev
A more sophisticated method for grouping the elements was suggested in 1869 by the Russian chemist...
dobereiner
One of the earliest efforts to group the chemical elements in some kind of logical sequence was made by the German chemist...
111
the modern periodic table is made up of _____ elements
atomic numbers
the primary modern periodic table differs from the original periodic table is that elements are now arranged according to their_____________
noble gases
the rows in the modern periodic table begin with the metals and end with _____________
periodicity
their properties appear to repeat on a regular basis, a phenomenon known as_____________
triads
this effort was based on the fact that some elements have similar properties and can be placed in groups of three elements, called...
increase by one
when moving from left to right across the modern periodic table, the atomic numbers of the elements______________
growth of sunflower
which of the following is not a periodic phenomenon
atomic mass
This method was based on the fact that, when the elements are arranged in order according to their_______
rows
In the first periodic table, elements with similar properties were placed together in_____
halogen
and example of such a group is the _________ group, consisting of chlorine, bromine, and iodine.
number of electrons
dobereiner and mendeleev both tried to relate the properties of elements to their______________
copper
early scientists classified _________as one of the coinage metals
increase
in dobereiners halogen triad, the density, boiling point, and melting point of the elements__________ as atomic mass increases
column
in the modern periodic table, elements in the same_______ have similar properties
18
mendeleevs first periodic table consisted of ___groups
eka aluminum
proof that this system of arranging the elements was correct came with the successful prediction of an element that had not yet been discovered, an element given the name of ________________. That element was discovered less than 20 years later.