The Periodic Table Flashcards
Why are elements put into groups?
They have similar chemical properties
Why do elements in the same group have similar chemical properties?
They have the same amount of electrons in their outer shell
How was the periodic table first arranged?
Atomic weights
Metals are elements that react to form what?
Positive ions
Non-metals are elements that do not react to become what?
Positive ions
What did Mendeleev do differently?
He left gaps for undiscovered elements and predicted their properties
If an atom has a full outer shell, it is what?
Unreactive
What are group 0 elements called?
Noble Gases
What is electron shielding?
More shileding means the electron is further from the nucleus which means it is more easily lost
As you go down Group 0, boiling point …
Increases
Group 1 elements are called the …
Alkali metals
As you go down Group 1, reactivity …
Increases
Group number is a way of identifying how many electrons in the …
Outer shell
Group 7 is known as the …
Halogens
The halogens are …
Non-metals
