# Lec: Periodic Table of Elements

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Lec: Periodic Table of Elements

H Hydrogen Element: Is the simplest form of matter. An atom is the smallest piece of matter that can be identified as an element.

H Hydrogen Atomic Name:

H Hydrogen Atomic Number: Indicates the number of protons and electrons in a neutral atom.

Atomic Mass: Measured in Atomic Mass Units or AMU’s
Atomic Mass: Measured in Atomic Mass Units or AMU’s. 1 AMU is equal to the mass of a proton. H Hydrogen

Atomic Symbol 1 or 2 letters
Atomic Symbol 1 or 2 letters. If the Atomic symbol has a second letter it must be lower cased. H Hydrogen

Calculating the number of Neutrons Atomic Mass - Atomic # = # Neutrons (rounded) Ex: Hydrogen = 0 Hydrogen has no neutrons.

Calculate the number of neutrons for O which is oxygen.

Oxygen Mass = 15.9994 or 16 Atomic Number = 8 16 - 8 = 8 Oxygen 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: amu’s Type of Element: Metal

Period 4 Group 5 Atomic Name Origin: English