Science Q3

• MASS - Amount of matter in a body or object.
• VOLUME- Amount of space that a body occupies
• DENSITY - Mass of matter per unit volume.
• IMPENETRABILITY - The inability of two portions of matter to occupy the same space at the same time.
• TEXTURE - The tactile surface characteristics of a material.
• MALLEABILITY - Ability to be hammered into sheets.
• DUCTILITY - Ability to be drawn out into thin wires.
• CONDUCTIVITY - Ability to allow heat and electricity to pass through.
• FLEXIBILITY- Ability to be bent without breaking
• ELASTICITY - Ability to return to its original shape or size after being distorted
• 1789 - ANTONIE LAVOSIER - “Father of modern chemistry” a French guy. Classified elements by similar properties
• 1817-1829 - JOHANN DOBERENEIR - DOBEREINERS TRIAD
• 1864 -JOHN NEWLANDS - Presented OCTAVES
• 1864 - LOTHAR MEYER - Arranged elements based on VALENCE
• 1869 - DMITRI MENDELEEV - Arranged elements based on atomic mass
• 1913 - HENRY MOSELEY - Arranged elements based on their ATOMIC NUMBER
• 1932 - JAMES CHADWICK - Discovered NEUTRONS
• ERNEST RUTHERFORD - GOLD FOIL EXPERIMENT
• NEILS BOHR - PLANETARY MODEL OF THE ATOM
• ERWIN SCHRODINGER - CLOUD MODEL OF THE ATOM
• JONS JACOB BERZELIUS - DEVELOPED CHEMICAL SYMBOLS, ELECTROCHEMICAL THEORY
• ELECTRON AFFINITY - the amount of energy liberated when an electron is added to a neutral atom to form a NEGATIVELY CHARGED ATOM
• The vertical columns are called GROUPS OR FAMILIES
• The last two periods are called the INNER TRANSITION ELEMENTS. The IANTHANIDE SERIES
• SUBATOMIC PARTICLES: PROTONS - POSITIVE CHARGE NEUTRON - NEUTRAL ELECTRONS - NEGATIVE
• LAW OF CONSERVATION OF ATOMS AND MASS ATOMS are NEITHER created or DESTROYED
• LAW OF DEFINITE PROPORTIONS TWO SAMPLES OF SAME ELEMENTS ARE SAME IN QUANTITY REGARDLESS OF SIZE AND SOURCES
• LAW OF MULTIPLE PROPORTIONS THE MASS OF ONE ELEMENT THAT COMBINES WITH ANOTHER IS THE RATIO OF THE WHOLE SMALL NUMBERS