Vocab

Element
Made up of identical atoms
Examples: Iron, oxygen, gold, aluminum, carbon

Vocab

● Atom

○ Smallest part of an element that retains its properties

○ Made of protons, neutrons, and electrons

Vocab

● Proton

○ Positive charge
○ Found in the nucleus (center) of an atom
○ 1 AMU (atomic mass unit)
○ Identifies the atom
○ Abbreviation p⁺

Vocab

● Neutron

○ Found in the nucleus
○ No charge
○ 1 AMU (atomic mass unit)
○ Helps to make the nucleus stable
○ n⁰

Vocab

● Electron

○ Found outside the nucleus
○ Negative charge
○ 1/1836 AMU (atomic mass unit)
○ Balance the proton’s + charge
For an atom the number of protons number of equals electrons
○ e^-

Atomic Number

● The number of p⁺ (and same number of e^-)
● Cannot change
● Identifies the atom

Mass number

Number of p⁺ and average number of n⁰
This is the mass number has decimals #average
Yo! Round this to the
nearest whole number!