The waterline is where the hull of a ship meets the surface of the water, it is also a special marking indicating the legal load limit of a ship, and, in naval architectural plans, it is any line drawn to delineate hull shape that is in a plane parallel to the surface of the water.
The atomic number refers to tell if the number has the amount of protons for a nucleus in an atom. This is shown that the chemical effects of an element has in its singular form in the periodic table
Carbon 12 and carbon 14 are two isotopes of the elements carbon.the difference between carbon 12 and carbon 14 is the number r of neutrons in each atom.the number given after the atom name (carbon) indicates the numbers of protons plus neutron is an atom or iron. Atom of both isotopes of carbon contain 6 protons
Hydrogen H weight: 81
Non-metal
Hydrogen is the simplest element; an atom consists of only one proton and one electron. It is also the most plentiful element in the universe. Despite its simplicity and abundance, hydrogen doesn't occur naturally as a gas on the Earth--it is always combined with other elements.
period 1 group 1
Hydrogen is easily the most abundant element in the universe. It is found in the sun and most of the stars, and the planet Jupiter is composed mostly of hydrogen. On Earth, hydrogen is found in the greatest quantities as water.