History
What was the name of a Greek philosopher that had the idea that everything was made of elements?
Aristotle
The periodic is a chart that shows ___...
all of the known chemical elements in one place.
Periodic trends are _____ ____ that are present in the periodic table that show different aspects of a certain elements.
specific patterns
In ancient times, things like ___, and ___, were accessible
Gold and Silver
The periodic table shows us how many ___, so that elements that are similar in properties, line up.
protons,electrons and atomic mass,
The major periodic trends are electronegativity, ionization energy, electron affinity, atomic radius, melting point, and _______
metallic character.
In 1649, a new elements was discovered was called phosphorus by ___ Brand.
Hennig
How many known elements are there?
118
Periodic trends, come from the arrangement of the periodic table, provide chemists with an invaluable tool to quickly predict an element's _____
properties.
In ____, Antoine Lavoisier made the earliest attempt to classify the elements.
1789
We use the numbers of protons in the nucleus to identify the element, this is called the
atomic number
These trends exist because of the _______ within their respective group families or periods, and because of the periodic nature of the elements.
similar atomic structure of the elements
He was a Russian chemist and he had published the first widely recognized periodic table.
Dmitri Mendeleev
The periodic table is structured into ___ and ____
periods and groups
what are one of the major periodic trends?
melting point