Download Atomic Structure

Atomic Structure

Look at the comments below and decide on the correct answer
by clicking on the shaded box.

Choose the correct response from the drop down menu
that appears.

Then mark your work by looking at the answers on the answer
sheet.
1. Atoms contain three different particles. Protons have a (i)
charge,
neutrons have a (ii)
charge and electrons have a (iii)
charge.
2. The nucleus contains (i)
and (ii)
.
3. What is meant by the statement: “All atoms are neutral”?
They contain the same number of
.
4. Which of the following BEST describes the term atomic number?
It is the number of neutrons in the nucleus.
It is the number of protons in the nucleus.
It is the number of electrons in an atom.
5. The mass number is the number of
in the nucleus of an atom.
6. Which of the following BEST describes the term isotopes?
Atoms of the same element that contain different numbers of neutrons.
Atoms of the same element that contain different numbers of electrons.
Atoms of the same element that contain different numbers of protons.
7. Which of the following pairs are isotopes?
(i)
(ii)
12
6
C
(iii)
15
7
N
(iv)
14
6
(v)
18
C
8
(vi)
40
O
19
K
40
18
Ar
Answer
8. The electron arrangement for the calcium atom,
40
Ca
20
is
9. Which of the following represent the same element (take care with this one!)?
Note that
represents a proton and
a neutron.
(iii)
(ii)
(i)
(iv)
Answer
10. Use your Periodic Table to complete the following table
Symbol
B
B
C
Mass number
11
10
12
Number of protons
5
Number of neutrons
Electron arrangement
6
2,4
Atomic Structure Answers
1.
(i) positive; (ii) zero; (iii) negative
2.
Protons and neutrons
3.
Protons and electrons
4.
It is the number of protons in the nucleus
5.
Protons and neutrons
6.
Atoms of the same element that contain different numbers of neutrons.
7.
(i) and (iii)
8.
2,8,8,2
9.
(i), (ii) and (iii)
10.
Symbol
B
B
C
Mass
number
11
10
12
Number of
protons
5
5
6
Number of
neutrons
6
5
6
Electron
arrangement
2,3
2,3
2,4