Atomic Structure
1)
Complete the following table;
Atomic
Element
Mass
Number
P
2)
7
Number
Number
Number
Number
Electron
of protons
of electrons
of neutrons
Configuration
14
Q
23
R
40
11
2,8,8,2
The following table gives information about the electronic configuration of various elements.
Use this information to complete the final two columns in the table below.
Element
Electron Configuration
Atomic Number
Group number
in the periodic table
3)
A
2,1
B
2,3
C
2,8,1
D
2,8,4
E
2,8,6
F
2,8,8,2
Complete the information in the following table;
Total Number
Number of outer
of electrons
electrons
Atomic Number
Electron Configuration
in the periodic table
2,8,3
9
9
19
Group number
4)
The element neon occurs naturally as a mixture of isotopes, Ne (mass 20) and Ne (mass 22).
(Atomic Number Ne = 10)
5)
a)
How many of each of the fundamental particles are present in the nucleus of Ne 22?
b)
What is the electron configuration of Ne 20?
c)
Why is neon a very unreactive element?
d)
Explain the meaning of the word isotope.
e)
What is the difference between the two isotopes of Neon?
Use the information below to answer questions a-e;
Atomic Number
Electron Arrangement
Element
Mass Number
A
12
6
2,4
B
14
6
2,4
C
19
9
2,7
D
23
11
2,8,1
E
40
18
2,8,8
a) Which of the elements are Isotopes?
b) Which atom has 8 neutrons in it's nucleus?
c) Which element is unreactive?
d) Which two atoms have a valency (combining power) of 1?
e) Which two elements form ions with the same electronic configuration as neon?
6) The atomic
numbers and
mass numbers of
some elements
are as follows;
Element
R
S
T
U
V
W
X
Y
Z
Mass number
19
22
23
32
35
39
39
40
40
Atomic number
9
10
11
16
17
18
19
19
20
a) How many protons are there in the nucleus of T?
b) How many electrons are there in an atom of U?
c) How many neutrons are there in the nucleus of V?
d) Write down the electron configuration of W.
e) Which of the atoms are isotopes of the same element?
f)
7)
Which of the atoms would you expect to form an ion with charge of +2?
Complete the following table;
Particle
Atomic Number
Mass Number
Number of
Protons, Electrons, Neutrons
Aluminium atom (Al)
Oxide Ion (O2-)
Ca2+ ion
Lithium atom (Li)
13
27
8
20