PPT-Isotopes The atom Atom: It is a unit of matter that is the smallest unit of an element,

The nucleus is at the centre of the atom and contains the protons and neutrons Protons and neutrons are collectively known as nucleons The subatomic particles Protons are positively charged . Isotopes. Isotopes. : atoms of the same element that have different numbers of neutrons. Two isotopes of an element will have the same atomic number, but different mass numbers (and atomic masses). CARBON (above right). Bio “Life” . +. . Chemistry “Chemical Reactions”. . =. The study of chemical reactions in living things. . Why Biochemistry?. One characteristic of living things: life depends on . chemical reactions!. Jasmine . Sudhu. 5/30/13. Chemistry 10.. What are Isotopes?. Isotope – Is the average mass of atoms. You round of the atomic mass to the nearest whole numbers to get your two possible Isotopes.. Example – Boron- Atomic mass = 10.81. After rounding to the closet two whole numbers which are 10 and 11, your . SECOND EDITION. Unit 1: ALCHEMY. Matter, Atomic Structure, and Bonding. Lesson 13: Subatomic Heavyweights. Isotopes. ChemCatalyst. A chemist investigating a sample of lithium found that some lithium atoms have a lower mass than other lithium atoms. The chemist drew models of the two different types of lithium atoms, as shown on the following slide.. Components of an atom. Atoms are made of . . Protons . Electrons. Neutrons . Symbols and Atomic . Structure. Isotopes. . are atoms of an element with identical chemical properties, but different masses due to a difference in the number of neutrons.. The lab technician shown here is using a magnifying lens to examine a bacterial culture in a petri dish. When scientists cannot see the details of what they study, they try to obtain experimental data that help fill in the picture.. Unit 1: ALCHEMY. Matter, Atomic Structure, and Bonding. Lesson 13: Subatomic Heavyweights. Isotopes. ChemCatalyst. A chemist investigating a sample of lithium found that some lithium atoms have a lower mass than other lithium atoms. The chemist drew models of the two different types of lithium atoms, as shown on the following slide.. Atoms and Isotopes. What you need to know about Atoms . and Isotopes:. Matter. Molecules. Elements. Chemical reaction. Periodic Table. The Atom. Parts of an atom. Isotopes. Unstable isotopes. Scientists and discoveries. Mr. . Polard. Physical Science. Section 1 . Structure of Matter. Vocabulary – Section 1. Matter. : . Anything that takes up space and has mass (pg72). Atom. : . A very small particle that makes up most kinds of matter and consists of smaller parts called protons, neutrons, and electrons (pg73). What number equals the number of protons?. Atomic Number. From the periodic table – . How is the mass of a “regular” (most abundant) atom determined?. Protons Neutrons = Atomic Mass. An Isotope is defined as…. III. How atoms differ. . A. Atomic Number. Equal to the number of protons – never changes; equals the number of electrons if AND ONLY IF the atom is . neutral. ; Moseley discovered . each atom has a unique number of protons in the nucleus. Rock, wood, air, metal, water, and animals are all matter. Matter. Elements. The various forms of matter are composed of one or more chemical elements. . An . element. is a pure substance that cannot be broken down into other substances by chemical means. . Atoms are neutral. Protons = Electrons. There are special kinds of atoms..... Ions. Isotopes. Ions. An Ion is an atom that has gained or lost ELECTRONS, so it has an overall charge. If an atom gains electrons, it’s overall charge becomes negative. If an atom loses electrons, it’s overall charge becomes positive. . Rutherford proposed that most of the mass of the atom was concentrated. . at the atom’s center. . Rutherford’s Model of the Atom. Rutherford’s experiment suggested that an atom’s positive charge is concentrated in the center of the atom .