Atoms, Isotopes & Relative atomic mass

• what are the 3 subtomic particles in an atom ?

  proton, neutron, electron
• relative mass and charge of protons ?

  Mass: 1

  Charge: +1
• relative mass and charge of electron ?

  Mass: 0.0005

  Charge: -1
• relative mass and charge of neutrons ?

  mass : 1

  charge : 0
• describe the nucleus ?

  -The central part of an atom

  -contains protons and neutrons

  -it has a positive charge because of the protons
• describe the electrons in an atom ?

  -electrons move around shells

  -they are negatively charged

  -electrons have no mass (really small)

  -they are tiny but their orbitals cover alot of space
• number of electrons = number of protons
• what does the atomic number tell you in a periodic table ?

  The number of protons
• atoms of the same element have the same number of protons so atoms of different elements have different numbers of protons
• what is the mass number ?

  The total number of protons and neutrons
• how are molecules formed ?

  when atoms join together
• what is an isotope ?

  An isotope is a variant of an element that has the same number of protons and a different number of neutrons
• what is the relative atomic mass in this image ?

  =39

  
• how to calculate the Relative Atomic Mass of chlorine with a relative mass isotope of (35.0 and relative abundance of 3) and (a relative atomic mass of an isotope of 37.0 and a relative abundance of 1) ?

  = (35.0x3)+(37.0x1)

  ____________

  3+1