Chem Vocab 08/20/15

Protons +

• 1/3 subatomic particle
• Positively charged
• Mass= 1amu

Neutrons

• negative charge
• found outside the nucleus
• 1amu
• 1/3 subatomic particles

Electrons

• negative charge
• 1/3 subatomic particles

Isotope

• same element
• same # of protons and electrons
• Different # of neutrons and different mass
• 0 or insignificant mass

Isotope

• same element
• same # of protons and electrons
• Different # of neutrons and different mass
• 0 or insignificant mass

Period

• Row going across of the periodic table

Groups

• Columns going up and down the periodic table

Chemical Property

• Characteristic of a substance that indicates whether it can undergo a chemical change.

Atomic number

• Number of protons and electrons in an atom

Mass number

• The sum of the number of protons and neutrons.