Atomic structure and bonding

Scenario One
You are working in a laboratory, and a series of samples is received which you are
asked to identify. The samples are provided by an organisation which does not have
specialised chemistry knowledge, so your essay should include significant
information to enable them to understand how you have identified the samples, as
well as an explanation of the basic structure of an atom. Through experimentation
you discover that the samples have the following atomic numbers:
a) 9
b) 36
c) 47
d) 56
You must explain the concepts of ‘mass number’ and ‘relative atomic mass’, and
explain what the difference is between them.
Finally, you have been asked to calculate the ‘nucleon number’ for each of these
samples and explain what this means.

Scenario Two
Consider the same four elements that you identified in scenario one. For each of
these, you need to write their electron configurations in terms of s, p, d and f shells,
and then explain your reasoning.
Review the periodic table below.
There are 5 elements identified with a black circle. Deduce the electron structure of
all five based upon their positions in the periodic table and explain your reasoning.

Scenario Three
Read the following extract:
“Atmospheric ions are electrically charged particles which occur naturally in the
atmosphere. They form in the upper atmospheric layers mainly because of the action
of ultraviolet radiation from the sun, as well as in lower atmospheric layers as a result
of radioactive radiation and cosmic rays. These cause ionisation of neutral molecules
or atoms. As a result, ions are formed. These ions almost instantaneously combine
to form molecules with ionic bonds.”
The extract mentions ‘ions’. Explain what these are in terms of their electronic
structure, and how this is different from an atom.
The extract mentions ‘ionic bonds’. Explain what these are, and how they form in
terms of electron structure.

Scenario Four
Read the following extract:
“A polymer is a substance which has a molecular structure comprising of a large
number of identical molecules covalently bonded together to form a long chain
structure. Many synthetic organic materials are polymers, such as nylon, polythene
and Kevlar.”
The extract mentions ‘covalent bonds’. Explain what these are, and the formation of
different types that can exist i.e. single, multiple etc.
Do some research and identify 4 simply covalently bonded molecules. Draw dot and
cross diagrams of each to show the bond formation of each of your 4 examples

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