C2 Flashcards
Alkali metal
Elements in group 1 of the periodic table
Halpgens
Elements in group 7
Universal indicator
A mixture of indicators that can change through a range of colours to show how strongly acidic or alkaline liquids and solutions are
What was mendeleevs breakthrough
He arranged elements by atomic weights and then arranged them into to property groups and left gaps for undiscovered elements
What do non metals and metals tend to do when forming ions
Metals tend to lose electrons whereas mon metals tend to gain them
Why are the noble gases in group zero unreactive
They have stable arrangements
What are elements in group 1 of the periodic table called
Alkali metals
What happens to melting points as you go dowm in a groip
They decrease
What is produced when alkali metals react with water
Hydrogen and a alkaline solution containing the metal hydrooxide
What happens to the reactivity as you go down in group 1
It increases
What are elements in group 7 also called
Halogens
What ions do halogens form
They all for, ions with a single negative charge in their ionic compounds with metals
What bonds to halogens form
Halogens form covalent bonds by sharing electrons with other non metals
What does a more reactive halogen to do another halogen
It can displace it
What happens to the reactivity of halogens going down in the group
Decreases
