Asubstance that cannot be broken down into simpler substances by chemical means. an element is composed of atoms that have the same atomic number, that is, each atom has the same number of protons in its nucleus as all other atoms of that element. today 117 elements are known, of which 92 are known to occur in nature, while the remainder have only been made with particle accelerators. eighty-one of the elements have isotopes that are stable. the others, including technetium, promethium, and those with atomic numbers higher than 83, are radioactive. see periodic table.
Answers: 1
Chemistry, 22.06.2019 20:20
Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa
Answers: 2
Chemistry, 22.06.2019 23:00
Arectangle has a diagonal 20 inches long that forms angles of 60 and 30 with the sides. find the perimeter of the rectangle. for geometry
Answers: 3
Chemistry, 23.06.2019 05:40
Why is it incorrect to balance a chemical equation by changing the subscripts? explain.
Answers: 2
Asubstance that cannot be broken down into simpler substances by chemical means. an element is compo...
Mathematics, 26.03.2021 19:50
Mathematics, 26.03.2021 19:50
Mathematics, 26.03.2021 19:50
Chemistry, 26.03.2021 19:50
Geography, 26.03.2021 19:50
History, 26.03.2021 19:50
Mathematics, 26.03.2021 19:50
Social Studies, 26.03.2021 19:50