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Lecture 2.1 – Introduction to the Periodic Table Today’s Learning Target • 1.3 – I can create a Periodic Table and explain how atomic number, atomic mass, and periodic trends are illustrated on this table. The Periodic Table • On the Periodic Table, we are told the following about every element: – Atomic Number – Atomic Mass – Element Name – Element Symbol Atomic Number • Atomic Number – The number of protons in the nucleus of an atom. • Atomic number is the same for all atoms of the same element. Atomic Number Atomic Mass • Atomic Mass – The mass of an atom • Atomic Mass = # Protons + # Neutrons Atomic Mass Element Name and Symbol • Every element has a 1 or 2 letter symbol. • The first letter is ALWAYS capitalized. Periodic Table Arranged By Atomic Number • The Periodic Table is arranged by increasing atomic number since this is what makes an element unique from another element. • Two elements can have the same atomic mass, but two elements can never have the same atomic number