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