Flashcards in KS3 Chemistry Deck (11)
How do you calculate the number of outer electrons?
The group number
How do you calculate the number of shells?
What is an isotope?
Atoms that have the same number of protons but different numbers of neutrons
What is an ion?
A particle with the same number of protons as its parent atom but with different number of electrons
What is the rule for forming ions?
The outer shell must be either full or empty to form an ion- whichever uses the least energy
Metal + oxygen ...
Metal + acid ...
Salt + water
Metal +water ...
Metal hydroxide + hydrogen
Trends in reactivity in group 1
Increases going down
Trends in reactivity in group 7
Decreases going down