EVERYDAY SCIENCE

Detailed explanation-1: -Gold is a chemical element with symbol Au and atomic number 79. Classified as a transition metal, Gold is a solid at room temperature.

Detailed explanation-2: -Gold consists of only gold atoms. Therefore, it is a pure substance. Whereas air consists of 78% nitrogen, 21% oxygen, 0.04% carbon dioxide, and 0.96% of water vapour and other gases. Therefore, the air is a mixture.

Detailed explanation-3: -Gold is element 79 and its symbol is Au. Though the name is Anglo Saxon, gold originated from the Latin Aurum, or shining dawn, and previously from the Greek. It’s abundance in the earth’s crust is 0.004 ppm. 100% of gold found naturally is isotope Au-197.

Detailed explanation-4: -Answer and Explanation: Gold (Au) is an element whose atomic number is 79, so gold is classified as a pure substance because elements are composed only of the atoms of the same element (or are composed of the same type of particles) and are considered pure substances.

Detailed explanation-5: -gold (Au), chemical element, a dense lustrous yellow precious metal of Group 11 (Ib), Period 6, of the periodic table of the elements.