SNC1DW Chapter 5

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Author:
Jaimin_Jethva
ID:
273812
Filename:
SNC1DW Chapter 5
Updated:
2014-05-08 21:38:29
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science chemistry
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Description:
Chapter 5 glossary terms and definitions.
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  1. Atom
    The smallest particle of an element that retains the identity of the element.

  2. Electron
    A negatively charged particle within the atom.

  3. Subatomic particle
    A particle that is smaller than an atom.

  4. Nucleus
    The positively charged centre of an atom.

  5. Proton
    A positively charged particle that is part of every atomic nucleus.

  6. Neutron
    An uncharged particle that is part of almost every atomic nucleus.

  7. Energy levels
    Areas of space surrounding the nucleus of an atom that electrons occupy.

  8. Atomic Number
    The number of protons in the nucleus of an atom.

  9. Mass Number
    The sum of the number of protons and the number of neutrons in the nucleus of an atom.

  10. Isotope
    One of two or more forms of an element that have the same number of protons but a different number of neutrons.

  11. Atomic Mass
    The average mass of the naturally occurring isotopes of an atom.

  12. Periodic Table
    A system for organizing the elements into columns and rows, so that elements with similar properties are in the same column.

  13. Metal
    An element that is hard, shiny, malleable, and ductile, and is a good conductor of heat and electricity.

  14. Non-metal
    An element that is not shiny, malleable, ductile, and is a poor conductor of heat and electricity.

  15. Metalloid
    An element that shares its some properties with metal and some properties with non-metals.

  16. Period
    A horizontal row of elements in the periodic table.

  17. Group
    A vertical column of elements in the periodic table.

  18. Alkali metals
    Found in Group 1. They have low melting points and are highly reactive.

  19. Alkaline-Earth metals
    Found in Group 2. They are also highly reactive, but less so than Alkali metals. They are often used in fireworks since they produce colourful flames.

  20. Halogens
    Found in group 17. These non-metals are highly reactive and extremely corrosive.

  21. Noble gases
    Found in group 18. These non-metals are all odourless, colourless gases at room temperature. However, they are non-reactive.

  22. Valence electrons
    An electron in the outermost occupied energy level of an atom.

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