1d The periodic Table Flashcards
What is a period?
A repeating pattern of any kind is called a periodic pattern.
Each row in the periodic table is called a period.
The most obvious repeating pattern is from metals of the left hand side to non metal on the right hand side
Each period starts with a very reactive group 1 metal and ends with a very unreactive gas in group 8
What is a group?
Elements with similar properties fall into a column
Each column is a group of similar elements
Why does the reactivity in Group 1 increase as you go down the group?
Group 1 elements have similar properties because of the electronic structure of their atoms. They all have 1 electron in the outer shell.
In a reaction, an atom of a Group 1 element will form an ion with a single positive charge. When an atom loses an electron it is known as oxidation. The ions that are formed have stable electronic structures like group 0
Why does the reactivity in Group 7 decrease as you go down the group?
Halogen displacement reactions are redox reactions because the halogens gain electrons.
As we descend group 7, the reactivity decreases. For stability, the atom needs to have a full outer shell. Group 7 elements need to gain 1 electron to have a full shell.
