Elements and Compounds (Elements (Definitions (group of atoms- element…
Elements and Compounds
is made when atoms from two or more different types of atoms are joined together.
A compound is the substance produced when two or more elements combine in a chemical reaction.
A compound has very different properties to the elements from which it is made.
Properties of metals/ non-metals
They can be found on the
. There are 88 elements that are metals.
; easily shaped and can withstand movement.
i.e. nickel, cobalt and iron.
Metals are often
after being polished as there is a strong reflection due to their smooth surfaces.
Metals have strong
Due to their strong bonds, metals have high
Metals are good
to pass through them easily.
when they react with
when they are combined with other metals.
because there are lots of atoms in a small space.
; they can be stretched into wires but don't break easily due to their flexibility.
; they make a noise when they are hit.
and don't reflect light.
Some non-metals can be found on the Periodic Table; 22 to be exact.
Non-metals are not strong because the bonds are mostly strong but the structure is
and their structures are held together by
bonds and shatter easily.
Non-metals oxides are
because they have a pH below 7.
because there are not many particles in the space of non-metals.
and are all
meaning electricity cannot flow through them.
They react with
to make oxides oxides as they burn in oxygen.
Non-metals have low melting and boiling points.
is the smallest unit that exists. Atoms cannot be created or destroyed.
group of atoms- element (oxygen)
2+ type of atoms- compound (H2O- water)
atom- a tiny particle
There are 100 elements in the Periodic Table.
Elements are pure substances made up of only one atom.
For elements the first letter is always a capital letter and the second letter is always small.
is made up of atoms held together by chemical bonds.
Lead reacts with oxygen to form