Atomic structure and bonding related to properties of materials.

Isotopes question.
There are three different types of neon atom shown in the table opposite.







 (a)             What term is used to describe these different types of neon atom?





(b)     A natural sample of neon has an average atomic mass of 20.2.

What is the mass number of the most common type of atom in the sample of neon?





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Bonding question
<p class="MsoNormal" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:.45pt;margin-bottom:.0001pt;line-height:99%;mso-pagination:none; mso-layout-grid-align:none;text-autospace:none"><span style="font-family:"Times New Roman","serif"">Hydrogen can form bonds with other elements.

<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height: 12.75pt;mso-line-height-rule:exactly;mso-pagination:none;mso-layout-grid-align: none;text-autospace:none">

<p class="MsoNormal" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:.45pt;margin-bottom:.0001pt;line-height:99%;mso-pagination:none; mso-layout-grid-align:none;text-autospace:none"><span style="font-family:"Times New Roman","serif"">The diagram shows the arrangement of outer electrons in a molecule of hydrogen chloride.

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<p class="MsoNormal" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:28.45pt;margin-bottom:.0001pt;text-align:justify;text-justify:inter-ideograph; text-indent:-28.45pt;line-height:99%;mso-pagination:none;mso-list:l0 level1 lfo1; tab-stops:list 28.45pt;mso-layout-grid-align:none;punctuation-wrap:simple; text-autospace:none"><span style="font-family:"Times New Roman","serif"; mso-fareast-font-family:"Times New Roman""> (a)    <span style="font-family:"Times New Roman","serif"">What type of bonding is present in a hydrogen chloride molecule?

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<p class="MsoNormal" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:.45pt;margin-bottom:.0001pt;line-height:83%;mso-pagination:none; mso-layout-grid-align:none;text-autospace:none">

<p class="MsoNormal" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:.45pt;margin-bottom:.0001pt;line-height:83%;mso-pagination:none; mso-layout-grid-align:none;text-autospace:none"><span style="font-family:"Times New Roman","serif"">(b) Draw a similar diagram, showing all outer electrons, to represent a molecule of phosphine, PH <span style="font-size:14.0pt;line-height: 83%;font-family:"Times New Roman","serif"">3<span style="font-family:"Times New Roman","serif"">.

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