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The Development of the Periodic Table

Worksheet Overview

QUESTION 1 of 10

All materials - living and non-living - are made of atoms. They combine in millions of different ways to make everything we see around us, even us! Scientists discovered the structure of the atom and this helped them arrange the elements in order on the Periodic Table. Mendeleev was the pioneer, arranging the elements in order of relative atomic mass. He realised that the properties of elements were related to their relative atomic mass and put the elements with similar properties in vertical groups, the same groups we see on the Periodic Table today. However, at the time not all elements had been discovered, but that did not put him off. He simply realised that there were more elements to be discovered and left gaps on the Periodic Table for those elements! Mendeleev went even one step further to predict the properties of the missing elements and turned out to be right when those elements were finally discovered! A feat of brilliance that has earned him a spot in every scientists ‘great scientist’ list.

 

 

Dmitri Mendeleev (1834-1907), a Russian chemist, published the Periodic Table in 1869.

 

 

But Mendeleev wasn’t the first person to try and do that and he had help from his predecessors. A guy called Döbereiner in the 1800’s put the elements into groups of 3’s called the triads. He noticed that they all had similar properties and the when you took an average of their atomic mess it always turned out to be the same as the middle mass. Well, it happened most of the time…

Then a guy called Newlands came along and noticed that there were patterns with every 8 elements when you lined them up by atomic mass. So lithium, sodium and potassium all had similar properties and where all 8 spaces away from each other – this was a big deal. But it only worked for the first 20 elements, so something was going on.

Mendeleev worked out that if you put the two groups together and then left gaps, you could make it all work – he had just discovered the periodic table.

 

In 1913 a British chemist, Henry Moseley, realised that it would be better to use atomic number rather than mass, so he put the final touch on the Periodic Table, after resolving some issues that surfaced from Mendeleev's work. 

The Periodic Table, as we know it today, is shown below. Familiarise yourself with the position of alkali metals (Group 1), halogens (Group 7), metals and non-metals, transition metals and noble gases (Group 0).

 

 

 

 

Who was the pioneer of the Periodic Table?

Sir Isaac Newton

James Joules

Dmitri Mendeleev

Henry Moseley

Which group on the periodic table are the halogens? 

Group 0

Group 7

Group 1

What group on the periodic table are the noble gases? 

Group 0

Group 13

Group 3

What group on the Periodic Table are the alkali metals?

Group 0

Group 1

Group 13

Where are the transition metals mainly found on the periodic table?

Left

Right

Centre

Where can you find most metals on the periodic table?

On the left

On the right

In the center

Where can you find most non-metals on the periodic table?

On the left

On the right

In the center

What was special about Mendeleev​'s periodic table? 

It contained all of the atoms

He left gaps for undiscovered elements

He put atoms with similar properties together

He put the atoms in order of atomic weight.

Why do we now know that Mendeleev's periodic table is the best way of grouping the elements? 

We can see the patterns in the electron structures.

He arranged the elements in no particular way

It dons't work for all of the elements.

What did Moseley change in Mendeleev's periodic table which improved it?

He rearranged it in order of atomic mass

He rearranged it according to elements' properties

He rearranged the elements in order of atomic number and properties

  • Question 1

Who was the pioneer of the Periodic Table?

CORRECT ANSWER
Dmitri Mendeleev
EDDIE SAYS
Dmitri Mendeleev created the first edition of the Periodic Table. He now has an element named after him (Mendelevium)
  • Question 2

Which group on the periodic table are the halogens? 

CORRECT ANSWER
Group 7
EDDIE SAYS
The halogens are Group 7.
  • Question 3

What group on the periodic table are the noble gases? 

CORRECT ANSWER
Group 0
EDDIE SAYS
The Noble Gases are Group 0.
  • Question 4

What group on the Periodic Table are the alkali metals?

CORRECT ANSWER
Group 1
EDDIE SAYS
The Alkali Metals are Group 1. They are on the left-hand side of the periodic table - they are the first group (hence being called group1).
  • Question 5

Where are the transition metals mainly found on the periodic table?

CORRECT ANSWER
Centre
EDDIE SAYS
Transition metals are mainly in the centre.
  • Question 6

Where can you find most metals on the periodic table?

CORRECT ANSWER
On the left
EDDIE SAYS
Most metals are on the left. As you move towards the right-hand side, you hit the semi-metals in a diagonal line, like carbon and silicone. Then you get the gases and non-metals like oxygen and argon.
  • Question 7

Where can you find most non-metals on the periodic table?

CORRECT ANSWER
On the right
EDDIE SAYS
Most non-metals are on the right. As we said, they all form up in a nice diagonal line on their periodic table - aren't patters nice?!
  • Question 8

What was special about Mendeleev​'s periodic table? 

CORRECT ANSWER
He left gaps for undiscovered elements
EDDIE SAYS
Mendeleev realised that we were working with an incomplete list of the elements and so he left gaps in his table. he described 'eca-aluminium' 20 years before it was discovered and re-named galium.
  • Question 9

Why do we now know that Mendeleev's periodic table is the best way of grouping the elements? 

CORRECT ANSWER
We can see the patterns in the electron structures.
EDDIE SAYS
Even after his death, we now know that he must have been correct as when we look at the atoms we see that there is patterns in the electron structure as well as their properties.
  • Question 10

What did Moseley change in Mendeleev's periodic table which improved it?

CORRECT ANSWER
He rearranged the elements in order of atomic number and properties
EDDIE SAYS
In 1913 a British chemist, Henry Moseley, realised that it would be better to use atomic number rather than mass, so he put the final touch on the Periodic Table, after resolving some issues that surfaced from Mendeleev's work.
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