Unit 1- Elemets Flashcards
0
Q
What two things does each element have?
A
A name and a symbol
1
Q
How many elements is the world made from?
A
About 100
2
Q
How are elements classified?
Name three
A
- naturally occurring or made by scientists
- solid, liquid or gas
- metal or non metal
3
Q
How have scientists arranged classified elements?
A
By putting them into the periodic table
4
Q
How are the elements arranged?
A
- increasing atomic number
- if they are in the same column they have similar chemical properties
- if they are in the same column they have the same number of outer electrons
5
Q
What is group 7 called?
A
The Halogens
6
Q
What is group 1 called?
A
Alkali metals
7
Q
What is group 8 called?
A
Noble gases
8
Q
Are the noble gases reactive?
A
No they are very unreactive
9
Q
Are the alkali metals reactive?
A
Yes they are very reactive
10
Q
Are the halogens reactive?
A
Yes they are very reactive non metals
11
Q
Where are the transition metals found?
A
Between groups 2 and 3 in the periodic table
