Chlorine is a halogen in group VII A of the periodic table with atomic number 17, an atomic weight of 35.45, and a density of 1.56 Mg/m 3. In the solid state it forms a tretragonal crystal with a ...

The atomic number is shown below the chemical symbol, and the mass number is shown above. In this example the atomic number is 17 and the mass number is 35. This means that each of these atoms has: ...

The records show that Mendeleev discovered the periodic system on 17 February 1869. In fact ... to show that their frequencies were proportional to the square of the atomic number. Up until this point ...

The clock hands are set by the Bulletin of the Atomic Scientists, a group formed by Manhattan Project ... The furthest the clock has been set was 17 minutes to midnight, in 1991, after the collapse of ...

The element with atomic number 89, two places to the right of our 87 ... The energy needed is 393 kJ mol -1 some 17 kJ mol-1 more than for caesium. This means that francium is not the metal that most ...

On the 60th anniversary of the nation's first atomic weapon test, experts trace how policy, politics and purpose laid a ...

They’re increasingly worried about their old age and the limited time to convey the firsthand horror they witnessed 79 years ...

Many survivors of the Hiroshima and Nagasaki attacks have dedicated their lives to campaigning for nuclear disarmament. Their ...

TOKYO (AP) — The recipient of this year’s Nobel Peace Prize is a fast-dwindling group of atomic bomb survivors who are facing ...

Uranium price rebounded from Sept low, suggesting a potential upward trend influenced by nuclear energy developments. Read an ...

Nihon Hidankyo is a grass-roots movement of survivors from Hiroshima and Nagasaki. The group’s efforts have helped establish a “nuclear taboo,” the Nobel committee said.

For example, the atomic number of chlorine is 17. Every chlorine atom has 17 protons and 17 electrons. It has 17 positive charges and 17 negative charges, meaning that it is neutral overall.