Atomic structure

• What is the structure of an atom?

  An atom consists of a dense nucleus surrounded by electrons in shells.
• What does the nucleus of an atom contain?


  The nucleus contains protons and neutrons.
• What are the three main subatomic particles in an atom?


  The three main subatomic particles are protons, neutrons, and electrons.
• What charge do protons have?


  Protons have a positive charge.
• Where are protons located in an atom?


  Protons are found in the nucleus.
• What is the mass of a proton?


  The mass of a proton is 1 atomic mass unit (amu).
• What charge do neutrons have?


  Neutrons have no charge (they are neutral).
• Where are neutrons located in an atom?


  Neutrons are found in the nucleus.
• What is the mass of a neutron?


  The mass of a neutron is approximately 1 amu.
• What charge do electrons have?


  Electrons have a negative charge.
• What determines the element of an atom?


  The number of protons in an atom determines which element it is.
• What is the atomic number (Z)?


  The atomic number is the number of protons in the nucleus.
• What does the atomic number determine?


  The atomic number determines the element.
• What is the mass number (A)?


  The mass number is the total number of protons and neutrons in the nucleus.
• What do isotopes have in common?


  Isotopes have the same atomic number but different mass numbers.
• What is an atom?

  The smallest part of an element
• What is a molecule?

  Substance that contains TWO or more atoms chemically bonded together
• Whats a relative atomic mass (Ar)?

  The average mass of atoms of an element relative to the mass of an atom of carbon-12
• Whats the formula for relative atomic mass (Ar)?


  Ar = (mass x abundance) + (mass x abundance)/total abundance (100)

  
• What is the structure of an atom?

  • Each atom is made up of multiple smaller particles:
  • Protons
  • Neutrons
  • Electrons
  • Nucleus
  • Outershell
• What is the relative mass of an electron?


  1/1836
• What is the relative charge of an electron?


  -1
• What is the relative charge of a proton?


  +1
• What is the relative mass of a neutron?


  1
• What is the relative charge of a neutron?


  0
• What’s an isotope?


  Two or more atoms of the same element with the same number of protons but different number on neutrons
• What is an atom?


  The smallest part of an element
• What are the main components of an atom's structure?

  • Proton
  • Neutron
  • Electron
  • Nucleus
  • Outershell
• What is the relative mass of an electron?


  \(\frac{1}{1836}\)
• What is the relative charge of an electron?


  • 1
• What is the relative mass of a proton?


  1
• What is the relative charge of a proton?


  +1
• What is the relative mass of a neutron?


  1
• What is the relative charge of a neutron?


  0
• What is the mass number of an atom?


  • Total number of protons and neutrons
• What is the mass number of potassium (K) with 19 protons and 20 neutrons?


  39
• What is the atomic number of an atom?


  The number of protons in the atom
• How many electrons does an atom have if it has the same number of protons?


  It has the same number of electrons as protons
• Atomic structure