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Lawrencium is a synthetic chemical element with chemical symbol Lr (formerly Lw) and atomic number 103. It is named in honor of Ernest Lawrence, inventor of the cyclotron, a device that was used to discover many artificial radioactive elements.
The nucleus of the helium atom contains 2 massive, positively charged particles. Thus, Z, the atomic number = 2. Z is simply the number of protons, massive, positively charged particles, present within the nucleus. Z thus defines the identity of the element: Z=1, hydrogen; Z=2, helium; Z=3, lithium;.................Z=80, mercury. You do not have to remember these numbers, because in every exam you ever sit you should be provided a copy of the Periodic Table, which lists all the elements in order of atomic number.