C1 - Atomic Structure and the Periodic Table Flashcards
what is an element?
a substance where all the atoms are the same
all element have a …
symbol
every symbol for any element starts with a …
capital letter
what are compounds?
a substance with two or more different elements chemically combined in a fixed proportion
compounds usually have totally different —— to the elements they are made from
properties
to separate a compound into its elements, we use …
chemical reactions
A mixture is where we have …
different elements or compounds that are not chemically combined together
to separate a mixture we use ….
physical techniques
A molecule is …
a substance with any elements chemically joined
the small number to the right of the element shows …
how many atoms of that element there are
In a compound, if there is no small number to the right of an element it means there is ——- atom in that compound
only one
the small numbers that are to the right of brackets ….
multiply everything inside the brackets
