c2. Periodic table Flashcards

1
Q

How are elements in the periodic table arranged?

A

In the order of atomic number

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2
Q

Why is the periodic table called this?

A

Elements with the similar properties occur at regular properties

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3
Q

Why do elements in the same group have similar properties?

A

They have the same number of electrons in their outermost shell

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4
Q

How were elements arranged in the past?

A

In order of atomic weight

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5
Q

What were the problems with the early periodic table?

A

Not all of the elements have been discovered and when elements were placed in order of atomic weight, they ended up in the same group

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6
Q

How did the Mendeleev overcome the problems of the early periodic table?

A

he left gaps for undiscovered elements and he changed the order of some elements

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7
Q

What type of ions do metals form?

A

Positive

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8
Q

What type of ions do non-metals form

A

Negative

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9
Q

Where are metals found in the periodic table?

A

On the left and towards the bottom

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10
Q

Where are nonmetals found on the periodic table?

A

On the right towards the top

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11
Q

What are the elements in group 0 known as?

A

Noble gasses

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12
Q

Why are elements in group 0 unreactive?

A

The atoms have a stable arrangement of electrons. They have full outermost shells.

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13
Q

Why are elements in group 0 monoatomic?

A

They have a full shell and do not lose or gain electrons

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14
Q

What happened to the boiling point down group 0?

A

Boiling point increases

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15
Q

What are elements in group one known as?

A

Alkali metals

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16
Q

What happens to reactivity down group one?

A

It increases

17
Q

Why does reactivity increase in group one?

A

the group atoms get bigger there is a weaker attraction between the nucleus and so it becomes easier to lose electrons

18
Q

What happens when a group one element reacts with oxygen?

A

Alkali metal + oxygen = metal oxide

19
Q

What happens when a group one element reacts with chlorine?

A

Alkali metal + chlorine = metal chloride

20
Q

What happens when a group element reacts with water?

A

Alkaline metal + water = metal hydroxide + hydrogen

21
Q

What are the elements in group 7 called?

22
Q

Why does reactivity decrease down group 7?

A

the group atoms get bigger there is a weaker attraction between a nucleus so if it becomes harder to lose electrons

23
Q

Why are the halogens in group 7?

A

They have seven electrons in the outermost shell

24
Q

What colour vapour does fluorine have?

25
Q

What colour vapour does chlorine have?

26
Q

What colour vapour does bromine have?

27
Q

What colour vapour does iodine have?