Weegy: The answer is B. 6
Sally needs 6 more neutrons to add to complete her neutral atom of magnesium.
User: Which of the following is correct concerning subatomic particles?
A. The electron was discovered by Goldstein in 1886.
B. The neutron was discovered by Chadwick in 1932.
C. The proton was discovered by Thomson in 1880.
D. Cathode rays were found to be made of protons.
Weegy: The answer is B. The neutron was ... (More)