Transcript Do Now
Do Now Please write HW in your agenda. Please update your table of contents. Page # Title Date Ions and Isotopes 1/12 Please take the sheet from the front cart, fold it as a booklet with the table on the outside, and place it on to pg. If you have a finished Atomic Basics worksheet and poster to give me, take them out! Atomic Bonding Atoms use their valence electrons to bond and interact with other atoms. You could think of this as their way of “socializing”. The Octet Rule First let’s go to the video… Atoms want to have 8 valence electrons in their outer shell to become stable. OCTET RULE: Guideline that states that atoms tend to combine in such a way that they each have 8 electrons in their outer shells giving them the same electron setup as a Noble Gas. There are exceptions! Ions An ion is an atom that has lost or gained valence e-and is no longer neutral. Ions that have LOST electrons have a POSITIVE charge. These are called cations. Ions that have GAINED electrons have a NEGATIVE charge. These are called anions. Ions What happens when you change the number of electrons in an atom? The atom becomes an ion. Example: Sodium Example: Chlorine Ions and Isotopes What happens when you change the number of protons in an atom? You change the identity of the atom to a different element. WARNING! When changing the charge of an atom, you can NEVER change the number of protons! ONLY ELECTRONS! BRIGHT Atom Make a neutral atom of Lithium. What is the number of protons, electrons, and neutrons? p= _________ e-= _________ n= _________ • How do we make Lithium stable like a noble gas? p= _________ e-= _________ n= _________ Is the atom more positive or negative? ______________ By how many? ___________ Write the ion symbol: • BRIGHT Atom • Now make a neutral again. • Now I want a Lithium atom with a -3 charge. p= _________ e-= _________ n= _________ Is the atom more positive or negative? ______________ By how many? ___________ Write the ion symbol: Isotopes What happens when you change the number of neutrons in an atom? The atom becomes a different isotope of that element. Iphone Analogy Isotopes are like same models of Iphone with different amounts of memory. Isotopes An isotope is a version of an element that has a different number of neutrons. Isotopes all behave chemically behave the same Many isotopes are radioactive and can be used for determining the age of rocks, fossils, and artifacts. They also have many uses in the medical field. Draw his on pg Word bank Carbon-12 6p, 6n Boron Nitrogen Carbon-11 Isotopes Cation (+) Carbon-13 Anion (-) Ions Vocabulary ion isotope atoms that have lost or gained electrons atoms of the same element with different numbers of neutrons anion a negatively charged ion cation a positively charged ion