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.