CHEM 1073 Lecture Notes - Lecture 7: Ionic Compound, Nonmetal, Atomic Number

60 views5 pages

Document Summary

Mass increased a lot, no change in charge. Supposed an atom has 20 protons, 20 neutrons and 20 electrons. Mass is unchanged, becomes positively charged: atomic number (z) = number of protons in an atom, the number of protons determines the identity of the element, neutral atoms have equal numbers of electrons and protons. Isotopes (atoms of the same element with di erent masses: atoms with the same number of protons but di erent numbers of neutrons, have almost identical chemical properties, in nature, most elements exist as mixtures of isotopes. Symbols for atoms and isotopes (lo 27: x = the symbol of the element, a = the mass number (# of protons and neutrons, z = the atomic number (# of protons, example. Na with 11 protons, 12 neutrons, 11 electrons: 23 on top of 11 na, 23/11na. Practice with symbols for atoms: 12 protons, 14 neutrons. 26/12mg or 26 mg: 19 protons, 22 neutrons.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related textbook solutions

Related Documents

Related Questions