Structure Of The Atom Page 2

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CHEMISTRY
The modern periodic table
The elements in the modern periodic table are arranged in order of their atomic numbers.
Group
1
2
3
4
5
6
7
0
Period
relative atomic mass
1
4
1
He
H
atomic number
2
1
9
7
11
12
14
16
19
20
2
Li
Be
B
C
N
O
F
Ne
3
4
5
6
7
8
9
10
23
24
27
28
31
32
35.5
40
3
Mg
Na
Al
Si
P
S
Cl
Ar
The horizontal
11
12
13
14
15
16
17
18
rows are called
70
73
75
79
80
84
39
40
45
48
51
52
55
56
59
59
63.5
65
4
K
Ca
Sc
Ti
V
Cr
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
periods.
31
32
33
34
35
36
19
20
21
22
23
24
25
26
27
28
29
30
85
88
89
91
93
96
(98)
101
103
106
108
112
115
119
122
128
127
131
5
Rb
Sr
Y
Zr
Nb
Mo
Tc
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I
Xe
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
133
137
139
178
181
184
186
190
192
195
197
201
204
207
209
(209)
(210)
(222)
6
Cs
Ba
La
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
55
56
57
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
(223)
(226)
(227)
(261)
(262)
(266)
(264)
(277)
(268)
(271)
(272)
7
Fr
Ra
Ac
Rf
Db
Sg
Bh
Hs
Mt
Ds
Rg
87
88
89
104
105
106
107
108
109
110
111
Non-metals
are on
Metals
are on the
the right-hand side.
Elements with similar
left-hand side and
properties are placed in the
in the centre.
same vertical groups.
Mendeleev
The periodic table as we know it was rst made by Mendeleev, who arranged all the
elements known at the time into a table.
Mendeleev put the
He swapped the places
When these elements were
elements in order
of some elements so
discovered, Mendeleev's
of the relative
that elements with similar
predictions fitted the
atomic mass.
properties lined up.
properties very well!
He checked the
He left gaps where he
properties of the
thought there were other
elements and their
elements, and predicted
compounds.
their properties.
1. Write the symbol of an element that is:
1.
3. The atomic number of potassium is 19.
target
(a) in the same group as lithium (Li)
(1 mark)
(a) Write down the symbol for
G-E
(b) in the same period as lithium.
(1 mark)
potassium.
(1 mark)
2. Explain how you can tell from the periodic table
2.
(b) State the relative atomic mass of
(2 marks)
(1 mark)
that lithium is a metal.
potassium.
38

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