C2(The Periodic Table) Flashcards
What are the elements in group 7 called?
Halogens.
What are the elements in Group 0 called?
Noble gases.
What are the elements in group 1 called and why?
Alkali metals because they are metals that react with water to form an alkali.
When and who created the first periodic table? Why did they leave gaps in the periodic table and how did they order their periodic table compared to modern times?
In 1869, Dmitri Mendeleev created his version of the periodic table, leaving gaps to place elements not yet discovered. He ordered the periodic table in rows of increasing atomic mass compared to today’s increasing atomic number .
Name the properties of Group 0 elements.
Noble gases have full outer shells with eight electrons so they do not need to lose /gain any to become stable. They are very unreactive so exist as single atoms as they do not bond to form molecules. Their boiling points increase down the group.
What type of elements are group 7 elements.
The halogens are non -metals.
How does reactivity change in group 1?
As you go down the group of alkali metals, reactivity increases.
Why does reactivity increase as you go down group 1 (alkali metals )?
The atoms increase in size.
The outer electron is further away from the nucleus , and there are more shells shielding the outer electron from the nucleus.
How does melting and boiling point change as you go down group 1 (alkali metals)?
As you go down the group,the mp and bp decreases.
Why do elements in a group have similar chemical properties ?
Because they have the same number of electrons in their outer shell.
How are electrons listed ?
2,8,8,2 then whatever is left.
Why are group 1 elements stored in oil?
The alkali metals are stored in oil because they are so reactive.
