♡atomic structure♡

• What is a 'mass number'?

  Number of protons and neutrons in an atom.
• What is an 'atomic number'?

  Number of protons.
• What are elements?

  Elements are substances that contain only one type of atom.
• How is the periodic table arranged?

  Into groups (columns) and periods (rows).
• Elements in the same group have...

  same number of electrons in their outer-shell & similar properties.
• Elements in the same period have...

  Same number of electron shells.
• Which shell is always filled first?

  The inner shell.
• State the maximum number of electrons in each shell.

  Shell 1: 2 electrons

  Shell 2: 8 electrons

  Shell 3: 8 electrons
• Define a compound.

  Two or more elements chemically bonded.
• What are isotopes?

  Isotopes are atoms of the same element that have different numbers of neutrons.
• How do you calculate abundance?

  mass of 1st isotope + mass of 2nd isotopes multiplied by percentage of abundance.
• Where are protons, neutrons and electrons found?

  Protons and neutrons are found in the nucleus of an atom, while electrons are found in energy shells, surrounding the nucleus.