Atomic Structure by HC12110909719

VIEWS: 15 PAGES: 9

									Atomic Structure

    Hill Science 6
Mixtures and Solutions
What is an atom?
• Atom: the smallest
    unit of matter that
    is the substance

• First proposed by
    Democritus
•   (Ancient Greek)
Atomic Structure

• Atoms have 2 regions:
  – Nucleus: the center of the atom that
    contains the mass of the atom
  – Electron cloud: region that surrounds the
    nucleus that contains most of the space in
    the atom                        Nucleus
             Electron
             Cloud
What’s in the Nucleus?
• Nucleus contains:
  – Protons: positively
    charged subatomic
    particles
  – Neutrons: neutrally
    charged subatomic
    particles
What’s in the Electron Cloud?

• The electron is
  outside of the
  nucleus in the
  electron cloud
  – Electron: subatomic
    particle with a
    negative charge and
    relatively no mass
How do these particles interact?

• Protons and neutrons
    are compacted in the
    tiny positively
    charged nucleus.
•   The nucleus contains
    most of the mass of
    the atom
How do these particles interact?

• The negatively
 charged electrons
 are small and have a
 relatively small mass,
 but occupy a large
 volume of space
 outside the nucleus.
Electron Orbitals
How do the subatomic particles
balance each other?
• # of protons = # of
    electrons
•   Atoms are neutral
    – If 3 protons are
      present, then need 3
      electrons to balance
      the charge

    – The neutrons are
      neutral

								
To top