Atomic Number, Mass Number & Isotopes
Atomic Number (Z)
No. of protons in atom.
Also equals no. of electrons in a neutral atom.
Example:
Carbon
→
Z = 6
Mass Number (A)
A = No. of protons + No. of neutrons
Example:
Carbon-12
→
A = 12
C. Isotopes
Atoms of same element with same atomic number but different mass number.
Examples
Hydrogen:
Protium (¹H₁), Deuterium (²H₁), Tritium (³H₁)
Carbon:
C-12, C-13, C-14
Uses
C-14
→
carbon dating
I-131
→
treatment of thyroid disease
D. Isobars
Atoms with same mass number but different atomic numbers.
Example:
Argon (A=40) and Calcium (A=40)
Atomic Number (Z)
No. of protons in atom.
Also equals no. of electrons in a neutral atom.
Example:
Carbon
→
Z = 6
Mass Number (A)
A = No. of protons + No. of neutrons
Example:
Carbon-12
→
A = 12
C. Isotopes
Atoms of same element with same atomic number but different mass number.
Examples
Hydrogen:
Protium (¹H₁), Deuterium (²H₁), Tritium (³H₁)
Carbon:
C-12, C-13, C-14
Uses
C-14
→
carbon dating
I-131
→
treatment of thyroid disease
D. Isobars
Atoms with same mass number but different atomic numbers.
Example:
Argon (A=40) and Calcium (A=40)
Atomic Number, Mass Number & Isotopes
Atomic Number, Mass Number & Isotopes
Neutral Traditional Gazebo Lined Blank Note A4 Page 1 of 1
