Gases and metals
He could predict other elements because there was an obvious gap, but he couldn't predict the noble gases because he didn't realize that there was going to be an 18th group since none of them were yet discovered. When he first started organizing the periodic table, the pattern still made sense even without the noble gases.
I would hope that "chromium" is obvious. Slightly less obvious is that "oxide" refers to the presence of oxygen.
Scientists mainly compare similarities and differences in what the organisms look like. With the less obvious relations, they analyze their DNA. The goal is to find a common ancestor between the two organisms. The more recently that ancestor existed, the more closely related the organisms are.
Nucleus in the centre (with protons and neutrons) with the electrons revolving around it.
It was obvious from the look on his face that he had been the one to eat all the cookies.
There are a few very obvious differences between Christianity and Islam. They follow different holy books and also have different names for their God.
The only obvious differences between male and female crocodilians are their size differences :)
valance, although there is lot of variation here as well.
There are many differences, the most obvious being that the drift handles better.
The most obvious difference is that a bassoon is bigger, MUCH bigger.
Mendeleev named it the periodic table because he observed that when the elements were arranged by increasing atomic mass, their properties repeated in a periodic manner. This periodicity was the basis for organizing elements into groups and periods.
The anatomical differences between a squid and an octopus are obvious.
No, it's a compound and only elements are on the periodic table. The periodic table only consists of individual elements. Baking soda is a compound, which is many elements bonded together. It's formula (sodium bicarbonate) is NaHCO3. Within it, there is sodium (Na), hydrogen (H), carbon (C), and oxygen (O), which are all on the periodic table.
One of the obvious differences between the North and the South during the U.S. Civil War was that the North was anti-slavery and the South was pro-slavery.
heres the obvious para means disabled people only and Olympics is regular.
One is a frog, the other is a salamander. Both have slept with your mother.
An obvious answer is that the sources for the energy conversion is that the resources are renewable