Chemistry fundamentals

• What is a atom

  The smallest part of a element that can be recognised as that element
• What is a element

  A substance made of only one type of atom
• What is a compound

  A substance made of two or more different atoms that are chemically bonded
• What is a molecule

  A substance made of more than one atom chemically bonded
• what is a mixture

  A substance made of more than one thing not chemically bonded
• three subatomic particle

  protons neutrons electrons
• The masses of sub atomic particles

  Proton - 1 neutrons - 1 electrons - 0
• Relative charges of subatomic particles

  Proton - +1 neutron- 0 electron : -1
• Sub atomic particles arranged in a atom

  Protons and are in nucleus , electrons are orbiting in shells
• What is the plum pudding model of the atom

  A ball of positive charge with negative electrons studded into it
• What did the gold foil experiment prove

  The atoms have dense nucleuses with positive charge
• What is the atomic number of an atom

  The number of protons in an atom
• What is the mass number of an atom

  the number of protons + the number of neutrons in an atom
• Why is the number of electrons in an atom equal to the number of protons

  As their charges cancel out
• How do you calculate the number of neutrons in an atom

  Mass number -atomic number
• What did Chadwick discover

  The neutron
• What did Bohr experiments show

  The electrons are in specific shells
• What are isotopes

  Atoms of the same element with a different number of neutrons
• What is abundance

  The % of atoms in a universe with particular mass
• How are the electrons arranged in a atoms

  Orbiting the nucleus in shells
• How many electrons In first ,second and third shells

  2,8
• What are the groups in the periodic table

  1,2,3,4,5,6,7,0
• What can the group tell you

  about the electrons in an atom

  How many electrons in the outer shell
• What are the periods in the periodic table

  The rows in the periodic table
• What can a period tell you about the electrons in a atom

  How many shells an atom has
• Why did mendeleev put some elements in groups

  Because they had similar properties
• Why did Mendeleev leave gaps in his periodic table

  For elements that hadn’t been discovered yet
• How many electrons are in the element carbon

  6
• How are the electrons in carbon arranged

  2,4