atomic structure

• what is an atom?

  it's the smallest part of an element

  
• All atoms of a particular element are the same.

  
• Different elements have different atoms

  
• atom

  A) proton

  B) 1

  C) electron

  D) 0

  E) 1

  
• an atom contains

  subatomic particles

  A) electron

  B) proton

  C) neutron

  
• how many sub atomic particles are in the atom

  3

  
• protons and neutrons are in the

  centre of an atom

  
• the centre of an atom

  nucleus

  
• protons and neutrons are called

  nucleons

  
• electrons move around the nucleus in

  orbits

  
• the orbital paths of electrons are

  shells

  
• electrons move fast around the nucleus in

  orbital paths

  
• protons and neutrons have a

  heavier mass compared to electrons

  
• electrons have almost no

  mass

  
• protons and neutrons have the same

  mass

  
• protons have a

  positive electrical charge

  
• electrons have a

  negative charge

  
• neutrons have no

  electrical charge
• most atoms have a

  neutral charge

  
• why do atoms have a neutral charge?

  the number of electrons is equal to the number of protons

  
• a typical atom has a

  neutral charge

  
• what is a proton number

  the number of protons in the nucleus of an atom.

  
• the proton number is also known as the

  Atomic number

  
• the number of electrons present in a neutral atom is

  proton number

  
• the proton number determines

  position of the atom in the periodic table

  
• what is the mass number

  the total number of protons and neutron in the nucleus

  
• mass number is also known as the

  nucleon number

  A) atomic

  B) mass

  
• nucleon number is the

  mass number
• total number of protons and neutrons in the nucleus of an atom is the

  mass number
• What do we get if we subtract Proton number from Mass number ( nucleon) ?

  neutrons

  
• Nucleons ( proton + neutron) - Proton =

  neutrons
• atomic number and mass number can be shown using an

  atomic notation

  
• proton number is at the

  top

  
• atomic number is at the

  bottom

  
• this is an atomic notation

  A) chemical symbol

  
• how are individual atoms held together?

  strong electrostatic forces of attraction