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Who created the periodic table
Dmitri Mendeleev
In the early 1800s how were the elements in the periodic table arranged
Atomic weight
Until recently what were the two main ways to categorise elements
Physical and chemical properties
Atomic weight
Why in the 1800s were the elements organised by atomic weight
Protons, neutrons and electrons had not been discovered by then so there was no such thing as atomic number
Why were early periodic tables not complete
There were undiscovered elements
Why were elements placed in the wrong group in early periodic tables
Elements were in order of atomic weight and wasn’t taken into account their properties
What did Mendeleev predict
New elements
Roughly how many elements are there
100
What order are the elements in the modern periodic table arranged i n
Atomic number
Where are metals found in the periodic table
on the left
Where are non - metals found in the periodic table
on the right
What do elements with similar properties form
columns
What are the vertical columns called
groups
What does the group number tell you
The number of electrons in the outer shell
How many electrons in the outer shell do the elements in group 7 have
7
What are the rows called
periods
What are most elements
Metals
What type of ions do metals form
Positive
What type of ions do non - metals form
negative
What do atoms react to form
full outer shell
Name the physical properties of metals ( name 3 )
High melting and boiling point
Good conductor of heat and electricity
Shiny
hard
High density
Malleable
Ductile
Name the physical properties of non-metals ( Name 3 )
Low boiling and melting point
Insulator
Dull
Brittle
Low density
Not malleable
Not ductile
Where are transition elements in the periodic table
In the middle
What type of metals are group 1 metals
Alkali metals
Are alkali metals soft or hard
soft
What happens to the reactivity as you go down group 1
The reactivity increases
What happens to the melting and boiling points as you go down group 1
They get lower
What are group 7 elements called
The halogens
As you descend down group 7 what happens to the reactivity
Less reactive
As you descend down group 7 what happens to the boiling and melting points
Higher boiling and melting points
What are group 0 elements called
The noble gases
Do group 0 elements react
No because the elements have a full outer shell so they don’t need to react to get a full outer shell
How many electrons to elements in group 0 have in their outer shell excluding helium
8
What colour are the elements in group 0 at room temperature
They have no colour as they are colourless
Note
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