The symbol for a certain isotope of radium is 
. How many nucleons are there in the nucleus of this isotope?
Definitions:
Selma-To-Montgomery March
A pivotal event in the Civil Rights Movement where activists marched in 1965 from Selma to Montgomery, Alabama, to protest racial discrimination in voting.
Registered To Vote
The act of enrolling on an official list in order to be eligible to vote in elections.
Civil Rights Movement
A pivotal social and political campaign in the United States that sought to end racial segregation and discrimination against African Americans and secure legal recognition and federal protection of the citizenship rights enumerated in the Constitution and federal law.
Racial Segregation
Racial segregation is the enforced separation of different racial groups within a community, institution, or country, often resulting in unequal access to resources, services, and opportunities.
Q8: A store manager kept track of
Q16: A nurse measured the blood pressure of
Q23: A diffraction grating has 5000 lines per
Q24: Estimate the rotational energy (in eV) for
Q27: In the two-slit experiment, for the condition
Q34: The behavior of blackbody radiation was poorly
Q37: Suppose that a data set has a
Q49: According to the selection rule, when a
Q62: The atomic number is equal to the
Q64: In radioactive dating, carbon-14 is often used.