Chemistry- Atomic Structure

Atomic number: number of protons in the nucleus

Mass number: number of protons + neutrons in the nucleus

Mass of neutrons: mass number + atomic number

Isotopes: atoms of the same element with a different number of neutrons

Allotropes: different phisical forms of an element (eg: oxygen, ozone)

Protons

• relative mass= 1
• charge= positive 1
• position: nucleus

Neutrons

• relative mass= 1
• charge= 0
• position: nuleus

Electrons

• relative mass= 1/1836
• charge= negative 1
• position: outside the nucleus