Kami Export - BELLA PELINI - Worksheet 4 Atom, Ion, Isotopes Review (1)

Chemist__________________________________________________ Per_______ Date_______________ Worksheet 4 Atom, Ion, Isotopes Review Atoms ● Atomic Number = # protons ● The protons tell us the identity of the element ● In a neutral atom, the # protons = # electrons ● Protons and neutrons have a mass of 1 amu and the mass of the electron is negligible. Atomic mass is equal to the sum of the # neutrons + # protons. ● # neutrons = atomic mass - # protons Name Symbol Atomic # Mass # # protons # neutrons # electrons Selenium se 34 79 34 45 34 rn 86 86 radon 222 86 136 Au 79 79 gold na 78 79 118 sodium 11 22 11 12 11 Isotopes ● Isotopes are atoms of the same element with a different number of neutrons. ● Isotopes are distinguished from each other by including the mass number with the name and symbol. Name Symbol Atomic # Mass # # protons # neutrons # electrons 235 92 U 238 U 92 Carbon-12 Carbon-13 Ions Atoms can gain or lose electrons to become ions. ● ● Metals are cations and tend to lose electrons to become positively charged. # protons > # electrons ● Nonmetals are anions and tend to gain electrons to become negatively charged. # protons < # electrons ● Ions are distinguished from atoms by including the charge as the superscript with the element’s symbol. Name Symbol Atomic # Mass # # protons # neutrons # electrons Cation or 14 anion? aluminum Al+3 13 27 13 13 cation Iron ion Fe 26 56 26 30 24 cation 15 31 18 anion phosphorus p 9 19 15 16 9 anion fluorine F-1 9 10 All Mixed Up

● Complete the table below by first identifying if the element is an atom, ion, or isotope. Name Symbol Atom, Ion, Isotope? Atomic # Mass # # protons # neutrons # electrons P-3 15 29 Copper-63 18 35 30 19 30 10 4 4 Be+2 Ar Argon Particle Pictures ● Draw in the electrons and identify how many protons and neutrons are in each atom, ion, and isotope below. Oxygen-16 Oxygen-2 Oxygen-17