Question

please give the answer
​

Answer 1

Sisosnakskakaksbsosjqnsodhsjsjsijshwis

Answer 2

Answer:

By convention, elements are organized in the periodic table, a structure that captures important patterns in their behavior. Devised by Russian chemist Dmitri Mendeleev (1834–1907) in 1869, the table places elements into columns—groups—and rows—periods—that share certain properties. These properties determine an element’s physical state at room temperature—gas, solid, or liquid—as well as its chemical reactivity, the ability to form chemical bonds with other atoms.

In addition to listing the atomic number for each element, the periodic table also displays the element’s relative atomic mass, the weighted average for its naturally occurring isotopes on earth. Looking at hydrogen, for example, its symbol, \text{H,}H,start text, H, comma, end text and name appear, as well as its atomic number of one—in the upper left-hand corner—and its relative atomic mass of 1.01.

The periodic table of the elements