atoms

• what is everything made up of?

  atoms
• what is each atom made up of?

  multiple smaller particles
• what are the main parts of an atom?

  • central nucleus
  • electrons
  • protons
  • neutrons
• what do electrons do?

  orbit the nucleus on shells
• what is the nucleus made up of?

  protons and neutrons
• protons and neutrons have the same mass
• what is the relative mass of protons?

  1
• what is the relative mass of electrons?

  very small
• what charge to protons have?

  positive +1
• what charge to neutrons have?

  no charge = neutral
• what charge to electrons have?

  negative - 1
• what do atoms have a radius of?

  o.1nm
• what is most the the atom made up of?

  empty space
• how much times smaller is the nucleus from the atom?

  10,000 x
• when is the atom neutral?

  when the protons and electrons are equal
• what do we call atoms once it loses or gains electrons?

  ion
• when do atoms become a negative ion?

  when there are more negative electrons than positive protons
• when do atoms become a positive ion?

  when there are more positive protons than negative electrons
• what does each box in the periodic table represent?

  a different type of atom
• what is the elemental symbol?

  the 1 or 2 letter symbol that presents the element (e.g. Li, O)
• what does the bottom left corner of the element tell us?

  the atomic number = how many protons and electrons the atom has
• what does the top left corner of the element tell us?

  the mass number = total number of neutrons + protons in the atom
• how would you find out the number of neutrons in an element?

  mass number - atomic number