Elements And The Periodic Table Flashcards
Different types of atoms are called
Elements
Elements are unique and made up of
One type of atom
There are _ know Elements
118
Elements can have different numbers of _ and _
Protons
Electrons
The different numbers of protons and electrons explains all of the differences in
Physical properties of matter
Some elements exist at room temp as a
Gas
Some elements exist at room temperature as (2)
Solid
Liquid
Dmitri ivanovich mendeleev invented
The periodic table
Dmitri ivanovich mendeleev was
A Russian scientist
What year was the periodic table invented
1869
Each element sits in the grid according to
Its atomic number
Number of _ in an element defines its position in the periodic table
Protons
Numbers of protons in element defines its position in the periodic table according to
Modern periodic law
Atomic number is the number of _ an atom contains (2)
Protons
Electrons (if atom is neutral)
The periodic table contains _ major categories of elements
Three
