hydrogen
The Periodic Table was invented by Dmitry Mendeleyev. He grouped every known element and he used this table to predict the existence of other several elements. Mendelevium name pays homage to Dmitry Mendeleyev.
An ELEMENT can not be separated into other elements.
Johann Dobereiner grouped elements with similar properties into triads. In these triads, he observed that the properties of the middle element were the average of the other two.
Dobereiner was responsible for grouping element into triads. He grouped 3 element with same properties together.
Classification was used when scientists grouped chlorine with other natural elements in the periodic table based on their properties and characteristics.
An element's properties can be predicted based on its position in the periodic table, which is organized by increasing atomic number and similar chemical behavior. Elements with similar properties tend to be grouped together in columns, called groups, and rows, called periods. The arrangement of elements in the periodic table allows scientists to make predictions about an element's properties based on its location relative to other elements.
Oxygen is the element that can combine with almost all other elements.
ReactivityThe ease and speed with which an element combines with other elements and compounds is called the "reactivity" of the element.
ReactivityThe ease and speed with which an element combines with other elements and compounds is called the "reactivity" of the element.
ReactivityThe ease and speed with which an element combines with other elements and compounds is called the "reactivity" of the element.
ReactivityThe ease and speed with which an element combines with other elements and compounds is called the "reactivity" of the element.
there are grouped in clomesand rows ad groups