Natural science(physical science)

• Atoms are the smallest building blocks of matter
• A salt crystal consists of approximately 1,000,000,000,000,000,000 atoms
• An element consists of atoms of the same type
• Atoms of one element are all the same but differ from the atoms of all other elements
• 1,000,000 atoms will fit side by side between the millimeter marks of a ruler
• An element cannot be broken down by chemical means
• The Periodic Table has 118 elements
• Elements until number 92 are natural elements, the others are manufactured by chemists
• Examples of elements

  • Copper, silver, gold, oxygen, carbon, iron
• While everything consists of atoms, not all atoms are the same
• The Periodic Table lists all the elements in a table
• Atoms of all the elements differ from each other in size and mass
• Copper consists of identical copper atoms
• No matter what you do with an element, it cannot be broken down further by chemical methods into other substances
• The smallest quantity of copper is in one copper atom
• There are 118 different types of atoms
• Atoms cannot even be seen under a powerful microscope
• The known elements are listed in the Periodic Table of Elements
• An atom is too small to see with the naked eye
• Alchemists tried to change common metals into gold but were unsuccessful
• Element


  A substance that consists of atoms of the same kind
• Neutron


  A particle found in the nucleus of an atom that has no charge
• Electron


  A negatively charged particle that orbits the nucleus of an atom
• Nucleus


  The center of the atom
• The nucleus must not be confused with the nuclei found in plant and animal cells
• Nucleons


  Protons and neutrons together
• Almost all the mass of the atom is in the nucleus</b>
• Much of the atom consists of empty space</b>
• Electrons


  Negative particles that orbit the nucleus of an atom
• Nucleus

  Neutral particles called neutrons
• Nucleus

  Positively charged particles called protons
• Nucleus

  Consists of protons and neutrons
• Electrons are responsible for the volume of the atom</b>
• Protons and neutrons are thus responsible for the mass of the atom</b>
• Nucleus


  The core of the atom
• Much smaller than one unit
• The mass of the protons and neutrons is much greater than that of the electrons
• e

  Electron
• Protons

  Positively charged particles found in the nucleus of an atom
• Neutron


  A neutral particle found in the nucleus of an atom