NATS 1675 Lecture Notes - Lecture 1: Atomic Number, Atomic Mass

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6 Feb 2016
NATS 1675
- CHEMISTRY CRASH COURSE 2016-02-04 16:19
Introduction to Chemistry:
Atom: The building block for all matter
Consists of 3 subatomic particles
o 1. Protons
o 2. Neutrons
o 3. Electrons
Protons and neutrons make up the nucleus
Electrons orbit the nucleus
(Refer to figure 2.2 – Page 22)
o 1. Proton’s charge = +1
o 2. Neutrons charge = 0
o 3. Electrons charge = -1
The mass of a particular atom = # of protons + # of neutrons
There are 118 kinds of atoms called, elements
94 occur naturally, the rest are human made
Kinds of atoms are elements
How to find Protons, Electrons and Neutrons
o Atomic number = # of Protons
o # of Protons = # of Electrons
o Atomic mass – Atomic number/ #of Protons = # of Neutrons
Isotopes: Different form of a particular element. Depends of
the number of neutrons
o Example:
§ C – 6 = Carbon with six neutrons
§ C – 14 = Carbon with eight neutrons
Like charges repel, opposite charges attract
Ion - a charged particle; one or more extra electrons in the outer
orbit, on one or more missing electrons in the outer orbit
Battery on Sulfuric Acid = H2SO4
H+ H+ SO4-
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