KS3 Chemistry Flashcards
1
Q
How do you calculate the number of outer electrons?
A
The group number
2
Q
How do you calculate the number of shells?
A
Period number
3
Q
What is an isotope?
A
Atoms that have the same number of protons but different numbers of neutrons
Different mass
4
Q
What is an ion?
A
A particle with the same number of protons as its parent atom but with different number of electrons
5
Q
What is the rule for forming ions?
A
The outer shell must be either full or empty to form an ion- whichever uses the least energy
6
Q
Metal + oxygen …
A
Metal oxide
7
Q
Metal + acid …
A
Salt + water
8
Q
Metal +water …
A
Metal hydroxide + hydrogen
9
Q
Trends in reactivity in group 1
A
Increases going down
10
Q
Trends in reactivity in group 7
A
Decreases going down
11
Q
Trends in reactivity in group 0
A
Unreactive
Slightly increases going down
