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10 Cards in this Set
- Front
- Back
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What is a compound? |
Compounds are formed when atoms join together. When different elements react, atoms form chemical bond with other atoms to form compounds. Its usually difficult to separate the two original elements out again. |
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Why do elements take part in bonding? |
Making bonds involves giving atoms away, taking or sharing electrons. Only the electrons are involved - it's nothing to do with the nuclei of atoms at all. Creates new elements. |
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What is formed when electrons are transferred from one atom to another? |
The atom which gains electrons becomes a negative ion. The atom which gives electrons becomes a positive ion. |
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What type of compound do group 1 and Group 7 elements form? |
Ionic compounds |
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What types of ion are formed by Group 1 and 7 atoms? |
Positive and Negative ions. |
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What is an ionic compound? |
Ionic bonds form when a metal reacts with a non-metal. Metals form positive ions; non-metals form negative ions. Ionic bonds are the electrostatic forces of attraction between oppositely charged ions. Form giant ionic lattices. |
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What is ionic bonding? |
Ionic bonding occurs between positive(charged) and negative ions, which attract each other and bind together to form ionic compounds by transferring electrons. For example, sodium |
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How are covalent bonds formed? |
Covalent bonds are formed between non-metals. Each atom shares an electron with another atom. Each atom has to make enough covalent bonds to fill up its outer shell. |
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What are delocalised electrons? |
delocalised electrons are electrons in a molecule, ion or solid metal that are not associated with a single atom or a covalent bond. |
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How are delocalised electrons involved in metallic bonding? |
Electrons involved in metallic bonding do not move over to the other atom but instead stay in a sea of delocalised electrons that have a strong electrostatic attraction to positive ions in a large lattice. |
