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Question 1

In the 1860s scientists were trying to organise elements.

Figure 1 shows the table published by John Newlands in 1865.

Newlands arranged the elements in order of their atomic weights.

Figure 2 shows the table published by Dimitri Mendeleev in 1869.

Mendeleev's table became accepted by other scientists, but Newland's table was not.

a)

What is the modern name for atomic weight?

  A  

atomic number

  B  

relative formula mass

  C  

relative atomic mass

  D  

mass number

(0/1 marks)

b)

Complete the sentence.


In the modern periodic table, the elements are arranged in order of number.

atomic

(0/1 marks)

c)

Use the two figures and your own knowledge to:

  • compare and contrast Newlands’ and Mendeleev’s tables
  • explain why Mendeleev’s table was more acceptable

(0/6 marks)

0

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8

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