chem

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How were the early lists of elements ordered?
by atomic mass
1 of 16
Why did Mendeleev swap the order of some elements?
to group them by their chemical properties
2 of 16
Why did Mendeleev leave gaps in his Periodic Table?
leave room for elements that had not yet been
discovered
3 of 16
Why do elements in a group have similar chemical
properties?
have the same number of electrons in their outer shell
4 of 16
Where are metals and non-metals located on the
Periodic Table?
metals to the left, non-metals to the right
5 of 16
Why are the alkali metals named this?
they are metals that react with water to form an alkali
6 of 16
Why does the reactivity of the alkali metals increase
down the group?
they are larger atoms, so the outermost electron is
further from the nucleus, meaning there are weaker
electrostatic forces of attraction and more shielding
between the nucleus and outer electron, and it is easier
to lose the electron
7 of 16
Give the formulae of the first four halogens
F2
, Cl2
, Br2
, I2
8 of 16
How do the melting points of the halogens change
down the group?
increase (higher melting point)
9 of 16
How does the reactivity of the halogens change down
the group?
decrease (less reactive)
10 of 16
Why does the reactivity of the halogens decrease
down the group?
they are larger atoms, so the outermost shell is
further from the nucleus, meaning there are weaker
electrostatic forces of attraction and more shielding
between the nucleus and outer shell, and it is harder to
gain an electron
11 of 16
What is a displacement reaction?
when a more reactive element takes the place of a less
reactive one in a compound
12 of 16
Why are the noble gases inert?
they have full outer shells so do not need to lose or gain
electrons
13 of 16
How do the melting points of the noble gases change
down the group?
increase (higher melting point)
14 of 16
How does the reactivity of the alkali metals change
down the group?
increases (more reactive)
15 of 16
What is an ion
A charged particle
16 of 16

Other cards in this set

Card 2

Front

Why did Mendeleev swap the order of some elements?

Back

to group them by their chemical properties

Card 3

Front

Why did Mendeleev leave gaps in his Periodic Table?

Back

Preview of the front of card 3

Card 4

Front

Why do elements in a group have similar chemical
properties?

Back

Preview of the front of card 4

Card 5

Front

Where are metals and non-metals located on the
Periodic Table?

Back

Preview of the front of card 5
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