15
Atoms – Constituent Parts II
•
–
•
# of protons (Z) determines charge of nucleus
Þ
electrical properties
Þ
element
–
Chemical reactions involve sharing/exchanging
electrons
(See periodic table
A-16)
–
Hydrogen:
Z=1
–
Helium:
Z=2
–
Lithium:
Z=3
–
Carbon:
Z=6
–