Column A
1.
The mass number of the element above is _______.:
The mass number of the element above is _______.
2.
The atomic number of the element above is ____.:
The atomic number of the element above is ____.
3.
The element above has ________protons.:
The element above has ________protons.
4.
The element above has _______ neutrons.:
The element above has _______ neutrons.
Column B
a.87
b.136
c.223
d.310
1. c.223
2. a.87
3. a.87
4. b.136