MENDELEEVLESSON 1 - CHEMISTRY

LESSON OBJECTIVES

• Recall who Mendeleev was (Grade E)•Describe how important his ideas were for chemistry (Grade D)• Apply knowledge to understanding patterns in the modern periodic table (Grade C/B)

STARTER

Recall what you think the periodic table is?

Why is this table so important to science?

QUESTIONS – COPY INTO BOOK

• What is the table of elements called? • What was Mendeleev known for?• When was Mendeleev born?• What was his first idea called• What was one of the most amazing thing about Mendeleev’s discovery• What did Mendeleev spot in the table?• What was the element he had named after him?

VIDEO -RECALL WHO MENDELEEV WAS.

Watch and answer the questions

https://www.youtube.com/watch?v=IgA37CNa7Ow

ANSWERS

1) What is the table of elements called? Periodic table2) What was Mendeleev known for? Coming up with the original periodic table of elements3) When was Mendeleev born? In 1834 in Siberia4) What was his first idea called? Periodic law5) What was one of the most amazing thing about Mendeleev’s discovery? He discovered it 25 years before the discovery of the electron6) What did Mendeleev spot in the table? Holes to be filled with other elements What was the element he had named after him? Mendelevium

DESCRIBE HOW IMPORTANT HIS IDEA WAS FOR CHEMISTRY

A Russian chemist called Dmitri Mendeleev published a __________. Mendeleev also arranged the _______ known at the time in order of relative atomic ______, but he did some other things that made his table much more successful.He realized that the physical and ________ properties of elements were related to their atomic mass in a 'periodic' way, and arranged them so that ______ of elements with similar ________ fell into vertical columns in his table.

Elements, mass, periodic table, groups, chemical, properties

DESCRIBE HOW IMPORTANT HIS IDEA WAS FOR CHEMISTRY

A Russian chemist called Dmitri Mendeleev published a periodic table. Mendeleev also arranged the elements known at the time in order of relative atomic mass, but he did some other things that made his table much more successful.He realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table.

MENDELEEV DID NOT HAVE AN EASY JOB!

Take a worksheet and cut around the boxes can you put the cards into 3 columns?

Why have you decided to place them into theses 3 columns?

Check the group next to you have they completed it a similar way?

Which way do you think makes the most sense?

Bromine 

Atomic mass = 80 

Non-metal 

Liquid 

Red-brown

Strontium 

Atomic mass = 88 

Metal 

Solid 

Sinks in water

Potassium 

Atomic mass = 39 

Metal 

Solid 

Floats on waterCalcium

 Atomic mass = 40

 Metal

 Solid

 Sinks in water

Sodium 

Atomic mass = 23 

Metal 

Solid 

Floats on water

Chlorine 

Atomic mass = 35.5 

Non-metal 

Gas 

Yellow-greenLithium

 Atomic mass = 7

 Metal

 Solid

 Floats on water

Fluorine 

Atomic mass = 19 

Non-metal 

Gas 

Pale yellow

Magnesium 

Atomic mass = 24 

Metal 

Solid 

Sinks in water

 

Iodine 

Atomic mass = 127 

Non-metal 

Solid 

Purple-black

 

PLENARY

Write down 2 points which made Mendeleev so important to science.

Look at your own periodic table and give an example of how the now modern periodic table is arranged.

Extension:

Next lesson will be looking the the atom.

Can you attempt to draw an atom and label all parts (Hint: Electrons, protons and neutrons)