CC3+4

• What are subatomic particle?

  Smaller particles that an atom is made up of.
• What are the three subatomic particles?

  Protons, neutrons and electrons.
• What is an alpha particle?

  Small positively charged particles made of 2 protons and 2 neutron. +2charge.
• What is a nucleus?

  central part of an atom, 100000 times smaller than the overall atom.
• what was Dalton's model of atoms?

  tiny spheres, cannot be created or destroyed. Cannot be broken down. Atoms of an element are identical and that different elements have different atoms.
• What was Rutherford's experiment and what was his explanation?


  He fired alpha particles at a gold leaf and tracked where they went. most of the alpha particle went through and some other scattered. Atoms are mostly empty and there is a dense positive charge in the middle of an atom(nucleus).
• What is the atomic number?


  the bottom number on the periodic table, it gives the number of protons and electrons.
• What is the atomic mass?


  the top number of the periodic table. it gives the number of the total of protons and neutrons together.
• What is an isotope?


  An atom with the same number of protons but different numbers of neutrons.
• Who was Dmitri Mendeleev?


  A Russian scientist, developed the periodic table.
• Groups


  Columns in the periodic, arranged by similar chemical properties. Tells you the number of electrons of the most outer shell.
• Period


  Rows in the periodic table, arranged by the increasing atomic mass. Tells you the number of electrons shells.
• Group 1


  alkali metals, react with water to form an alkaline solution. Give away an electron.
• Group 7


  halogens, non-metals. Gain electron.
• Group 0


  Noble Gases, inert, don't take part in chemical reactions.
• metal


  left
• transition metal


  middle
• non-metal


  right
• What is electronic configuration?

  The arrangements of electrons on electron shells