Metals (and also transition metals are considered even though they aren't in specific families, they are the same as any other metal, nothing special.)
transition metals
Semimetals.
Phosphorus
6th and 7th period are the longest period of the perodic table
check out this amazing Perodic table at www.calculatoredge.com
What is the only letter not appearing on the perodic table as a symbol or part of the symbol
Those are family halogen. the seventh group in the periodic table.
perodic law
The periodic table of elements arranges all of the known chemical elements.
All chemical elements are placed in the perodic table of elements of Mendeleev.
At last count we were up to 114.
Hydrogen is in the periodic table because it is an element, and all elements are in the periodic table.
Francium
check this perodic table at www.calculatoredge.com
according to their increasing atomic numbers.
Dmitri Mendeleev in 1869. He was a Russian chemist. There were only 63 known elements at that time.
The state of elements depends on the temperature. Most periodic tables give the state of the elements at room temperature. Since only mercury and bromine are liquids at room temperature, these are the only elements listed as liquids on the periodic table.
He is famous for making the Perodic Table of elements which is a table (chart) of elements such as solds, liquids or gasses. He was born in Russia and is known for one of the best scients in history.
A Halogen.