Section 1
How are Elements Organized?
How can one show that elements that have different appearances have similar chemical properties?
Why was the pattern that Newlands developed called the law of octaves?
What led Mendeleev to predict that some elements had not yet been discovered?
What contribution did Moseley make to the development of the modern periodic table?
State the periodic law.
What do elements in the same period have in common?
What do elements in the same group have in common?
Why can Period 1 contain a maximum of two elements?
In which period and group is the element whose electron configuration is $[\mathrm{Kr}] 5 s^{1} ?$
Write the outer electron configuration for the Group 2 element in Period 6.
What determines the number of elements found in each period in the periodic table?
Are elements with similar chemical properties more likely to be found in the same period or in the same group? Explain your answer.
How many valence electrons does phosphorus have?
What would you expect the electron configuration of element 113 to be?