We also, confusingly, tend to refer to pure substances made of one kind of atom, like chlorine gas, as elements. But these are very different from the isolated atoms depicted on the periodic table.

The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

There are 118 elements in the periodic table, each with a unique symbol and atomic number. Symbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of ...

Damp litmus paper is bleached white when it is placed in chlorine. If damp-blue litmus paper is used, the paper turns red then white.

The chlorine atom has a higher electronegativity than the hydrogen atom ... The new scale uses electronegativity as a dimensionless quantity, which is very practical and accurately reproduces both ...

These are almost one-quarter of the periodic ... 11 are essential elements that our bodies need in larger amounts: oxygen, carbon, hydrogen, nitrogen, phosphorus, sulphur, chlorine, potassium ...