The atomic number of a nuclide that undergoes alpha decay

increases by 2
increases by 4
decreases by 2
decreases by 4

C. decreases by 2

The mass number decreases by 4, and the atomic number decreases by 2

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).