Day 1 – The Atom Sci 10 Chemistry

Definitions Chemistry: study of the structure and properties of matter Element: a substance with only one single type of atoms *found in The Periodic Table of Elements Atom: the smallest part of an element can exist on its own or in combination with other atoms

The atom is made up of 3 types of particles: protons: Positive charge (+1) In the nucleus (centre) of the atom neutrons: Neutral (no charge) (0) In the nucleus of the atom electrons : Negative charge (-1) In clouds (shells) that surround the nucleus

Group Activity Use your periodic table, Google, etc. to find the # of protons, electrons and neutrons for the atoms below. Model them with the playdoh provided. C Be H N Ne Complete the table and answer questions a,b,c. *You’re looking for patterns here.

Video – The Atom http://www.youtube.com/watch?v=lP57gEWcisY

An atom's mass The nucleus is the part with the greatest mass because protons and neutrons have larger masses than the mass of electrons

The Periodic Table - introduction The periodic table contains elements and information on them

The Periodic Table - introduction The element’s symbol is O The name of the element : oxygen The atomic number (the number of protons) : 8 The atomic mass (the average mass of an atom of this element) : 15.999 Rounding this number to the nearest whole number gives us the number of protons + neutrons : 15.999 rounded = 16 # of neutrons = atomic mass (rounded) – # of protons (atomic number) = 16 – 8 = 8 neutrons The number of electrons = the number of protons (atomic number) when the atom is neutral (not charged). Oxygen has 8 protons so it also has 8 electrons.

To Do Sign Lab Safety Contract and return Complete Day 1 The Atom Practice Questions Journal #1 – “The hardest thing I learned today was…..”