C9 Periodic Table Flashcards
Alkali metal (group 1) trends
as it goes down the table
- reactivity increases
- melting point decreases
-density decreases
Halogens (group 7) trends
as it goes down the table
-melting point increases
- reactivity increases
- boiling point increases
colour of the halogens
- fluorine
- chlorine
- bromine
- Iodine
- fluorine (yellow gas)
- chlorine (green gas)
- bromine (orange liquid)
- Iodine (purplish grey solid)
how many outer electrons does Halogens have
7 outer electrons
how many outer electrons does Alkali metals have
1 outer electron
what is the affect of the outer electron of an Alkali metal
the react as they are unstable because of the 1 outer electron
how are elements ordered in the periodic table
By increasing atomic number (number of protons)
what are vertical columns in the periodic table called?
Groups
what are the horizontal rows in the periodic table called?
Periods
what is the trend in the metallic character across a period
A gradual change from metal to no-metal
what happens to the number of electrons in the outer shell of an element across a period
it increases
what happens to the structure of an element across a period
Giant metallic- Giant covalent- simple molecular
why do elements in the same group react in a similar way
they have the same number of electrons in the outer shell
what is the same for elements in the same period?
they have the same number of shells of electrons
write a balanced symbol equation for the reaction of lithium with oxygen
lithium= Li
oxygen= O₂
4 Li + O₂ -> 2Li₂O
