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Unit 3 and 4

Chemistry Revision

Basic Information
What is an element? Contains one specific type of atom All atoms in the element have the same atomic number
What is the atomic number? The atomic number is the number of protons an atom has. eg Nitrogen has an atomic number of 4 so all Nitrogen atoms have four protons.
What is the atomic mass? The Atomic Mass tells us how heavy an atom is. It is roughly calculated by adding the number of protons and neutrons an atom has. Electrons can be excluded as they are much lighter.
What is an isotope? Isotopes are atoms of the same element that have a different mass. They have the same number of protons but a different number of neutrons.
What is relative atomic mass? Average mass of the different isotopes of an element.
What is an ion Atoms who gain or lose a negative electron become charged as they will have an unbalanced number of electrons and protons.
What is a cation If an atom loses an electron it becomes a Positive ion
What is an anion If an atom gains an electron it becomes a Negative ion
What is a molecule neutral group of two or more atoms held together by chemical bonds
What are compounds a group of two or more different types of atoms held together by chemical bonds
What is a mixture made from different substances that are not chemically joined
Chemical Bonding long lasting attraction between two atoms
What is chemical bonding A long-lasting attraction between two atoms that holds them together.
What is an Ionic Compound material that is formed of oppositely charged ions in a crystal lattice.
What are properties of an ionic compound high melting points, very hard, brittle, conduct electricity when dissolved
What is an ionic bond electrostatic force of attraction between two ions.Typically a metal gives an electron, or more than one electron, to a nonmetal.
What are covalent (molecular) compounds few atoms held together by bonds
What is a giant covalent?
What is a covalent bond
What is a single bond Single bonds have one pair of electrons. One from each a molecule of hydrogen
What is a double bond Double bonds have two pairs of electrons. Two from each atom. eg. a molecule of oxygen
What is a triple bond Triple bonds have two pairs of electrons. Three from each atom. eg a molecule of Nitrogen
Created by: 1077176592334881



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