The Periodic TableEdexcel GCSE Chemistry: Flashcards

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How did Mendeleev arrange his periodic table?

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How did Mendeleev arrange his periodic table?: By using the properties of elements and their compounds, leaving gaps for undiscovered elements.
What did Mendeleev use his table to predict?: The existence and properties of elements not yet discovered.
Why did Mendeleev's strict ordering by atomic mass sometimes fail?: Because the relative abundance of isotopes in some elements meant atomic mass order didn't always match the correct group placement.
Define atomic number in terms of the periodic table.: The number of protons in the nucleus, which determines the element's position in the periodic table.
What is a period in the periodic table?: A horizontal row of elements.
What is a group in the periodic table?: A vertical column of elements with similar chemical properties.
How are elements ordered in the modern periodic table?: In order of increasing atomic number.
Where are metals generally found in the periodic table?: Towards the left and bottom.
Where are non-metals generally found in the periodic table?: Towards the right and top.
What is the electronic configuration of sodium (atomic number 11)?: 2.8.1
How does period number relate to electronic configuration?: The period number equals the number of occupied electron shells.
How does group number relate to electronic configuration?: The group number equals the number of electrons in the outer shell.
Why do elements in the same group have similar properties?: Because they have the same number of electrons in their outer shell.