EMISSION SPECTRA - MARCH 5 CLAASS

Emission Spectra

• Each element gives of a specific colour of light
• These are known as emission spectra -Unique to each element
• If electrons absorb energy they can be bumped to a higher level
• When they fall to a lower level, they release that energy as light.
  

Atomic Structure

• Atoms are made up parts called subatomic particles
• Protons(+)
• Neutrons(neutral)
• Electrons(-)

Particle (Multiples of Proton) (Elementary Charges) Location

Mass Charge

Proton 1 1+ Nucleus

Neutron 1 0 Nucleus

Electron 1/1837 -1 Outside

Atomic Number -Number of protons

Isotopes

• The number of protons determine the type of element
• Changing the number of neutrons changes the isotope of the element.
• All isotopes have the same chemical properties

1 proton = protium

1 proton and 1 neutron = deuterium

1 proton and 2 neutrons = tritium

Mass Number

• Mass Number = total of protons and neutrons
• Symbol given is A
• Different Isotopes have different masses