I would imagine he just looked at the chemical properties of the elements he had in front of him and could predict what could come next. Also he might have noticed big gaps in atomic weights between certain elements and assumed that some element(s) could be inserted that have not yet been discovered to decrease the gaps.
Huygens studied many things in physics. He studied the laws of motion, some of which was modified and used to formulate parts of Newton's 3 laws. He studied astronomy and described Saturn as having one solid ring. He 'found' the moon, Titan, around Saturn. He studied a nebula and using his refracting telescope found that it was many stars close together and far away so they looked 'for like'. He studied time, as measured by…
Astronomy, the study of the stars, has been around since the first cavemen looked up at night. We know more about what the Greeks did because they wrote about it, and their books survived. Before the Greeks, we know that the Sumerians, the Babylonians and the Egyptians all studied astronomy, but relatively few of their writings survived the thousands of years since.
If you had looked in the periodic table, you would have seen that the element Oxygen has an atomic mass of 16 (or more precisely 15.9994) and if you were to take that atomic mass and subtract the atomic number from it (i.e. 8) you would get a difference of 8 which is the number of neutrons it contains. In short, oxygen is that element.
Organic chemistry can be looked at as the study of the structure, properties, composition, reactions and preparation of hydrocarbons and their derivatives. These compounds may contain any number of other elements, including hydrogen, nitrogen, oxygen, the halogens as well as phosphorus, silicon and sulfur. Organic substances will generally contain both carbon and hydrogen at their simplest forms, although even the basic functional groups will include oxygen.
He lined them up according to their properties and other characteristics. First, John Newlands looked at the atomic masses of the known elements. He noticed that elements with similar physical and chemical properties came in intervals of 8. (So the 1st, 8th and 15th element were similar.) He proposed this idea as a unifying principle of chemistry. But it didn't work very well - not all the elements matched up. Mendeleev's contribution was to suggest…
We place tellurium in a group called metalloids. A metalloid is an element that is sort of like a metal, but sort of like a nonmetal. Or, looked at another way, a metalloid is neither a metal or a nonmetal. The metalloids are a "bridge" between the transition metals and the nonmetals. Use the link below for more information on this element.
I did a diploma program from Must university and got promotion at my job. It is considered accredited by my employer. I looked up their accreditation and recognition information before joining the program. It is an accredited online university. I studied for the diploma there but it is also accredited to offer degree programs.
Nothing is following. Also, just take a look at the periodic table of elements (which, if you don't have one, can be easily looked up on google) which will give you the atomic number of each element. Every element has exactly as many protons as its atomic number, and in their neutral state (not ionized) they also have exactly that number of electrons.