Free Printable Atomic Structure Worksheets - Free Printable

Final Answer:
1. a) positive
b) no charge (neutral)
c) negative
d) protons and neutrons

2. Carbon (C): #P = 6, #N = 6, #E = 6
Neon (Ne): #P = 10, #N = 10, #E = 10
Potassium (K): #P = 19, #N = 20, #E = 19

3. Table completion:
Na: Atomic Number = 11, Mass Number = 23
K: Atomic Number = 19, Mass Number = 39
(Element with 38 protons): Symbol = Sr, Atomic Number = 38, Mass Number = 88
F: Atomic Number = 9, Mass Number = 19
(Element with Atomic Number 20, Mass Number 40): Symbol = Ca, #Protons = 20, #Electrons = 20, #Neutrons = 20
(Element with Atomic Number 50, #Neutrons 69): Symbol = Sn, Mass Number = 119, #Protons = 50, #Electrons = 50
I: #Protons = 53, #Electrons = 53, #Neutrons = 74