OCR GCE Chemistry - Periodic Table

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In 1880s, how were elements grouped?

-Atomic mass


How were elements categorised?

-Physical and chemical properties, and Relative Atomic Mass


How is the modern periodic table arranged?

-Proton number


Why was it difficult at the time to arrange the periodic table by proton number?

-Protons and electrons were not known, they could only measure relative atomic mass


In 1817, who attempted to group similar elements?

-Johann Döbereiner


What were Johann Döbereiner’s groups called?



Which 3 elements did he notice had similar properties?



Who was John Newlands? What did he do/notice?

-If he arranged elements in order of mass, similar elements appeared at regular intervals – every eighth element was similar. Known as octaves


Who created the first accepted version of the Periodic Table in 1869?

-Dmitri Mendeleev


How did Dmitri Mendeleev’s periodic table differ from John Newlands?

-Left gaps in the table where next element didn’t seem to fit


What was the advantage of Dmitri Mendeleev leaving gaps?

-Keeping elements with similar chemical properties in the same group

-Predicting properties of undiscovered elements in the gaps


How was Dmitri Mendeleev proved right?

-When elements were later discovered (germanium, scandium, gallium) with properties that matched Mendeleev’s predictions


Who made the MODERN periodic table in 1914?

-Henry Moseley


How did Henry Moseley arrange his elements?

-Atomic number

-Noble gases added (Group 0)


What was the final big chance by Glenn Seaborg?

-Suggested how the f-block elements fit into the Periodic Table


In the modern Periodic Table what represents to the rows and columns?

-Period (row)

-Group (column)


What is the similarity of all elements in the same period?

-Same number of electron shells (if you don’t worry about the sub-shells)


How many electron shells do the elements in Period 1?



What is the similarity of all elements in the same group? What does this mean?

-Same number of electrons in their outer shell

-Similar physical and chemical properties


How many electrons in the outer shell of Group 4 atom?



How many ‘block’s, can the periodice table be split into? What are they?


-s, p, d, f


Is 2p6 a complete sub-shell? Why?


-Only 6 electrons occupy a p sub shell


What does periodicity mean?

-Trends that occur (in physical and chemical properties) across periods?


What name is given to trends that occur across periods in terms of physical and chemical properties?



Metal to non-metal is a trend that occurs going **** to ***** in each period?

-Left to right


Name a factor that decreases across a period

-Atomic radius


Why does atomic radius decrease across a period?

-As the number of protons increases, the positive charge of the nucleus increases. Electrons are pulled closer to the nucleus, making atomic radius smaller


Name a factor the increases across period

-Ionisation energy


Why does ionisation


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