Ch. 2-Chemistry of Life Be able to distinguish between the atomic number and ato

Question

Ch. 2-Chemistry of Life Be able to distinguish between the atomic number and atomic mass. What do these numbers indicate? .Subatomic Particles Protons-found in the nucleus; positively charged (+1) o o Neutrons- found in the nucleus; no charge (0) o Electrons-found in orbitals; negatively charged (-1) lons- atoms with a positive or a negative charge o Cations- positively charged ion o Anions- negatively charged iorn Orbitals pH (acids vs bases); What is the pH scale. Recall that acids have a pH that is less than 7 (7). lonic bonds have a tendency to break when dissolved in water. lonic bonds form when two atoms are bonded together due to a transfer of electrons. Covalent bonds are formed when to atoms are bonded together due to the sharing of electrons Review electrons and how they distinguish the properties of atoms . o If you change the number of electrons of an atom, the properties of the atom change!! . electrons with a filled outer energy level are stable; electrons without a filled outer energy leve are reactive. o 2 electrons fill the first energy level o 8 electrons fill the second and third energy level Ch. 3- Molecules of Life

Explanation / Answer

Atomic number indicates

Atomic number = Number of protons in atom = Number of electrons in atom.

Atomic mass indicates

Atomic mass = Number of protons + Number of neutrons.

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