Post on 22-Dec-2015
Lec: Periodic Table of Elements
1 1.00794
H
Hydrogen
Element: Is the simplest form of matter. An atom is the smallest piece of matter that can be identified as an element.
1 1.00794
H
Hydrogen
Atomic Name:
1 1.00794
H
Hydrogen
Atomic Number: Indicates the number of protons and electrons in a neutral atom.
1 1.00794
H
Hydrogen
Atomic Mass: Measured in Atomic Mass Units or AMU’s. 1 AMU is equal to the mass of a proton.
1 1.00794
H
Hydrogen
Atomic Symbol 1 or 2 letters. If the Atomic symbol has a second letter it must be lower cased.
Calculating the number of Neutrons
Atomic Mass - Atomic # = # Neutrons(rounded)
Ex: Hydrogen1 - 1 = 0 Hydrogen has no neutrons.
Calculate the number of neutrons for O which is oxygen.
Oxygen Mass = 15.9994 or 16Atomic Number = 8
16 - 8 = 8Oxygen has 8 neutrons.
Types of Elements
Metals: 1. Good conductors of heat and
electricity. 2. Low melting points. 3. Malleable (Easily bent). 4. Shiny or lustrous.
Non-Metals: 1. Poor conductors of heat and
electricity. 2. Very high melting points. 3. Brittle. 4. Dull.
Metalloids: Have characteristics from both metals and non-metals.
The following elements are found in the liquid state of matter at room temperature: 35 and 80. These are either a metal or non-metal.
Periods and Groups
• Periods are horizontal rows on the Periodic Table of Elements increasing by Atomic Number.
• Groups are vertical columns on the Periodic Table of Elements where elements have similar chemical properties. Groups are also called families.
On your worksheet complete the table for the element: V
Atomic Name: Vanadium
Atomic #, # of Protons, and Electrons: 23
# of neutrons: 28
Atomic Mass: 50.9415 amu’s
Type of Element: Metal
Period 4
Group 5
Atomic Name Origin: English