6.1 Groups in the periodic table- group 1 Flashcards
Why can some elements be classed as Alkali metals or Halogens for example?
.The group of elements will have the same number of electrons in their outer shell, therefore will have similar chemical properties
Give two properties of Alkali metals
.Usually soft
.Low melting points
When lithium, potassium and sodium have reacted with water what do they create?
An alkaline metal hydroxide and hydrogen
How do Lithium, Potassium and Sodium react with water?
They react Vigorously
How does Lithium react with Water?
It fizzes steadily
How does Sodium react with water?
It melts into a ball and then fizzes quickly
How does Potassium react with water?
gives off sparks and hydrogen burns in a lilac flame
How does the reactivity of alkali metals differ down the group
The reactivity increases as you go down the group
What are positive metal Ions called?
Cations
Why does the reactivity of the elements increase as you go down the group?
Easier to form electrons and form positive metal ions
Why is it easier to lose electrons as you go down the group?
.Due to the increase in electron shells
What does the increase in electron shells mean?
This means there is more electron shielding and so decrease in attraction between the positively charged nucleus and the negative electrons
