SAFA virtual Academy
Science – Grades 9-12
Chemistry – 2022/2023
Name:
Modeling atomic structure – Home assignment
1- The diagram shows the structure of an atom.
a- Which element has atoms with this structure?
--------------------------------
b- Complete the sentences below using the following words.
electrons
protons
neutrons
(i)
The nucleus of an atom contains both --------------------- and --------------------.
(ii)
The particles in an atom which are negatively charged are called ---------------------
(iii)
The atom of any element has the same number of ------------------------ and
--------------------- .
HMH Chemistry/Unit 2/Lesson 1
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2- The element Fluorine is shown in the periodic table as:
a- Use the numbers listed above to complete the following sentences:
(i)
A fluorine atom has an atomic number of --------------------.
(ii)
A fluorine atom has -------------------- electrons in its energy levels.
(iii)
A fluorine atom has -------------------- neutrons in its nucleus.
(iv)
A fluorine atom has an atomic mass of --------------------.
3- Elements in the periodic table are represented by chemical symbols.
a- Draw lines to match each element to its chemical symbol.
Draw three lines only.
Neon
N
Ne
Nitrogen
Na
Sodium
HMH Chemistry/Unit 2/Lesson 1
S
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4- Write and draw the electronic configuration of the following atoms.
Element symbol
Electronic configuration
14Si
19K
2He
7N
12Mg
6- Complete the table below.
Element name
Chemical symbol
Silicon
S
Potassium
P
Chlorine
HMH Chemistry/Unit 2/Lesson 1
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5- Many scientists collaborated to come up with an accepted atomic model. The diagrams
below show some of the models suggested throughout the years.
a- Match each atomic model to its correct analogy:
The solid sphere model
The plum pudding model
The planetary model
b- Mention two differences between J.J Thompson’s and Rutherford’s atomic models.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------It’s never been a matter of luck!
HMH Chemistry/Unit 2/Lesson 1
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