Which of these elements has 12 protons in its nucleus (atomic number = 12)? What are the first 20 elements of periodic table - Science - Physical and Chemical Changes - 9807489 | Meritnation. com

A. Mg

B. S

D. C

D. He

Isay that this a true statement

Answer/// the transcontinental railroad wasn't completed until four years after the civil war ended, it wouldn't have made much of a difference if it was completed before the war as it only ran east to west not north and south,   the first battle between iron-clad ships took place during the civil war (1862) it made wooden naval ships obsolete. the gatling gun was invented during the civil war , it was the forerunner of modern machine guns;

In  microbiology, pure culture is a laboratory  culture  containing a single  species  of organism. it is usually derived from a mixed culture. pure culture transfers a small sample into new, sterile  growth medium  in order  to distribute the individual cells across the medium surface. it separates the individual cells. when the cells multiply, each will form a colony and it then may  be used to inoculate more medium.