WebElements: A Periodic Table on the Web

Periodic Table of Elements: Videos

Interactive Periodic Table of Elements

1

H 1.00794

Hydrogen

Element: The simplest

form of matter

Atom : the smallest

piece of matter that can be identified as an

element.

1

H 1.00794

Hydrogen

Atomic Name:

Hydrogen

1

H 1.00794

Hydrogen

Atomic Number: Indicates the number of: protons electrons

in a neutral atom.

1

H 1.00794

Hydrogen

Atomic Mass: Measured in Atomic Mass Units or (AMU).

1 AMU is equal to the mass of a proton.

DO NOT round the mass to the nearest whole number

1

H 1.00794

Hydrogen

Atomic Symbol 1 or 2 letters. The symbol comes from its English or Latin name.

Calculating the number of Protons

Atomic # = # of Protons

Ex: Hydrogen

Atomic # = 1

# of Protons = 1

Calculating the number of Electrons

# of Protons = # of Electrons

Ex: Hydrogen

# of Protons = 1

# of Electrons = 1

Calculating the number of Neutrons

Atomic Mass (rounded to the nearest whole #) - Atomic # = # of Neutrons

Ex: Hydrogen

Atomic Mass = 1 Atomic # = 1

1-1 = 0 Hydrogen has no neutrons.