The proton number (Z) of an atom is the number of protons it contains. All the atoms of a particular element have the same proton number (number of protons). The atoms of different elements have ...

Atomic Number and Atomic Mass: ... Mass Number=17+18=35. So, the mass number of this chlorine isotope is 35. Example 2: Potassium. Potassium is an essential nutrient for plants and animals.

Atomic number 24, atomic weight 51.996. The Elements of Steel Composition ... Carbon 1.35% Manganese 1.65% Phosphorous .04% Sulfur .05% Silicon .06% ...

Atoms are made up of protons, neutrons, and electrons. The number of protons in one atom of an element is its atomic number. Hydrogen has one proton, so its atomic number is one. Carbon atoms have ...