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The element with atomic number 17 is Chlorine. Each element on the periodic table has a unique atomic number, which is used to identify it. The symbol for Chlorine is Cl.

The atomic weight of an element is the average mass of its atoms, typically expressed in atomic mass units (amu). The atomic weight of Oxygen is 16 amu, which means that the average mass of an Oxygen atom is approximately 16 times the mass of a single proton or neutron.

The state of matter of an element is determined by its temperature and pressure. At room temperature, which is around 20-25 degrees Celsius, Helium is a gas. It has a low boiling point of -268.93 degree Celsius, which is why it is kept in balloons in a gaseous state.

The Earth's crust is composed of a variety of elements, but some are more abundant than others. Oxygen is the most abundant element in the Earth's crust, making up about 46.6% of the crust by weight. It is mostly combined with other elements such as silicon, aluminum, and iron to form minerals like silicates, oxides, and carbonates.

The elements on the periodic table are grouped together according to their chemical properties. Group 11 elements are also known as the coinage metals, which include Copper, Silver and Gold, this group of elements are characterized by their high density, malleability, and ductility, and are often used in coinage and jewelry.