Structures And Bonding - MCQExams.com

Giant lattice structure held together by attraction between positive and negatively charged ions

Elements such as Silicon, diamond and graphite. Compounds include SiO2

Low melting and boiling points which increase with increasing molecule size due to increased intermolecular forces.

Melting points are very high – a large amount of energy is needed to break all the covalent bonds

Conductors due to delocalised electrons

Melting points are generally high – lots of energy is needed to overcome the attractions between positive ions and delocalised electrons.

Formulae of these might include H2O each molecule contains 1 O and 2H atoms

Compounds containing a metal and non-metal.

Covalent compounds

Which of these is covalent?
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Which elements tend to lose electrons?

Magnesium bromide is an ionic compound with the chemical formula MgBr₂. What does the "2" tell you?

When an atom loses an electron, it becomes a:

In metals, the _______ electrons form a shared sea of electrons.

Atoms form ions in order to become

Many alloys are softer than the elements that are in them.

Why are alloyed metals usually stronger?

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They have atoms of different metals in them, which makes it easier for the layer to move past each other...less likely to break
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They have atoms of different metals in them, which makes it harder for the layer to move past each other...less likely to break

An alloy is made of __________ size particles while a pure metal is made up of _________ size particles.