The mass number of an atom is the total number of protons plus neutrons in its nucleus. Different isotopes of the same element have different mass numbers because their nuclei contain different numbers of neutrons. In the written symbol for a...

The number of PROTONS and NEUTRONS in the NUCLEUS of an ATOM. See also: ATOMIC...

The mass number (A), also called atomic mass number (not to be confused with atomic number (Z) which denotes the number of protons in a nucleus) or nucleon number, is the number of protons and neutrons (also defined as a less commonly known...

Good news and bad news. If you are a golfer, you may consider it good news that the wait for the first tee is getting shorter. If you are in the golf business, however, the news is disconcerting. According to figures released this...

Massachusetts unemployment dipped to 4.2 percent in December and averaged just 3.7 percent for the year, despite an ongoing recession gripping the nation. In November, the jobless rate rose to 4.3 percent from 4.2 percent in October, leading the state Division of...

Iran's hard-line president said Tuesday that Israel will one day be "wiped out" as the Soviet Union was, drawing applause from participants in a conference casting doubt on the Holocaust.President Mahmoud Ahmadinejad's comments were likely to further fuel the outcry prompted by the two-day gathering,...

This will forever be known as the Bug Game.A swarm of insects descended on Jacobs Field in the eighth inning of the Cleveland Indians' 2-1 playoff victory over the New York Yankees on Friday night, leading to a bizarre scene featuring players waving their arms...