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Flashcards in KS3 Chemistry Deck (11)
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1

How do you calculate the number of outer electrons?

The group number

2

How do you calculate the number of shells?

Period number

3

What is an isotope?

Atoms that have the same number of protons but different numbers of neutrons

Different mass

4

What is an ion?

A particle with the same number of protons as its parent atom but with different number of electrons

5

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

6

Metal + oxygen ...

Metal oxide

7

Metal + acid ...

Salt + water

8

Metal +water ...

Metal hydroxide + hydrogen

9

Trends in reactivity in group 1

Increases going down

10

Trends in reactivity in group 7

Decreases going down

11

Trends in reactivity in group 0

Unreactive
Slightly increases going down