Science - Chemistry: Important Groups Flashcards

1
Q

group 1

A

alkali metals
- react explosively with water
- all elements have 1 valence electron

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2
Q

group 2

A

alkali earth metals
- turn water alkaline
- commonly found in earth’s crust
- all elements have 2 valence electrons

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3
Q

group 17

A

halogens
- ‘salt formers’
- react with metal ions to form salts
- have 7 valence electrons

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4
Q

group 18

A

noble gases
- exist as single atoms
- hardly ever in chemical bonding
- have full valence shell

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5
Q

reactivity of group 1

A

all highly reactive because they can easily lose their 1 electron

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6
Q

reactivity of group 2

A

quite high reactivity because only 2 valence electrons

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7
Q

reactivity of group 17

A

highly reactive because they only need to gain one electron to form a full shell

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8
Q

reactivity of group 18

A

unreactive/inert because of full outer shell

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