Study Sheet 2 Atoms and Subatomic Particles
Study Sheet 2 Atoms and Subatomic Particles
Study Sheet 2 Atoms and Subatomic Particles
Term 2 – 2019/2020
Grade 7
**The materials of this study sheet are not on your book, so make sure you do not lose it
Objectives:
1. Explain that atoms are the smallest particles of matter and are made up of protons, neutrons,
and electrons.
2. Differentiate between protons, neutrons, and electrons in terms of their electrical charges,
5. Recognize that the elements in the same group have the same number of electrons on the
outer shell.
6. Recognize that the elements in the same period have the same number of shells.
7. Relate the reactivity of group 8 (or zero) elements to the number of the electrons on their
outer shell.
Read the information about the development of the periodic table and answer the
question that follow
H Li G Bo C N O
F Na Mg Al Si P S
Cl K Ca Cr Ti Mn Fe
Co, Ni Cu Zn Y In As Se
Pd Ag Cd U Sn Sb Te
I Cs Ba, V Ta W Nb Au
Pt, Ir Os Hg Tl Pb Bi Th
However, other chemists did not accept Newlands’ ideas. It was not until much
later that his contribution to the development of the modern periodic table was
recognized.
Q Write down one difference between the periodic table of John Newlands and Mendeleev’s
periodic table (the modern periodic table).
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Observe the periodic table below and then answer the questions
1) All the elements in the periodic table are made of three subatomic particles which are:
_________________________
_________________________
_________________________
2) The atomic number = _________________________ or ________________________
5) Calculate the number of neutrons for a magnesium atom (rounded mass number = 24)
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Fill in the table below with the symbol of the element, number of protons, electrons and
Fill in the table below with the symbol of the element, number of protons, electrons and
1) An atom contains 14 protons and 14 electrons. (Hint: use your periodic table)
a. What is its atomic number? _________________
b. What is the name of the atom? _________________
c. How many neutrons does it have? _________________
2) An atom contains 4 electrons and 5 neutrons. (Hint: use your periodic table)
a. What is its atomic number? _________________
b. How many protons does it have? _________________
c. What is the mass of the atom? _________________
d. What is the name of the atom? _________________
_________________
Electron Configuration
Instructions
3. If the shell is full, you must move onto the next outer shell until you have added the correct number of
electrons.
Carbon Chlorine
Lithium Neon
Complete the atomic structure for the first 20 elements of the periodic table by filling in the
shells with the correct number of electrons and then answer the questions below
For each element, use dots to show how many electrons are in each
shell. In the box below each atomic structure, write the electronic
configuration using the usual number notation.
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Write down the electronic configuration of the below elements and then answer the
question below
a) Aluminum _______________________
b) helium ________________________
c) silicon ________________________
Why?_____________________________________________________________________