11/29 A/B DayLEQ: Why is Potassium (K) more similar to Beryllium (Be) than it is to Sodium (Na)?

1. What is the difference between an ion and an isotope?

2. What is a valence electron?3. What is seafloor spreading?4. At what type of boundary do we find rift

valleys?5. What is pangaea?

Today’s LEQ: Why is Potassium (K) more similar to Beryllium (Be) than it is to Sodium (Na)??

By the end of today, you should be able to…1. Explain why some elements are more reactive

than others2. Predict the activity of valence electrons3. Predict elements that will likely react with each

other

Focus Vocabulary

68. Valence Electron69. Reactivity70. Compound

Activating Strategy: STOP AND JOT

Make a list of 5 traits or characteristics that you share with members of your family

-your characteristics can be physical (like your height) OR something about your personalities

Share Out

Ms. Lorant and her brother, Carter Things we have in common: -similar hair color

-both love to read

-both went to the University of North Carolina

-both athletic

-both love chocolate- covered pretzels

Elements have families too!

REMEMBER….VALENCE ELECTRONS: ELECTRONS IN THE OUTERMOST RING

Elements in the same GROUP have the same number of VALENCE ELECTRONS

How many valence electrons do I have?

Hydrogen:

How many valence electrons do I have?

Lithium:

How many valence electrons do I have?

Sodium:

Same group = same # of valence electrons

Match each element with an element with an EQUAL number of valence electrons!

Rubidium (Rb)Fluorine (F)Oxygen (O)Francium (Fr)

Bromine (Br)Silicon (Si)Sulfur (S)Chlorine (Cl)Iodine (I)

Hot Q: Which has more valence electrons: Boron or Neon?

Elements with a FULL ring of electrons are STABLE elements.

EOG Exit Ticket

How can a scientist, using the periodic table, find an element with properties similar to another element?a) By comparing densityb) By finding its periodic groupc) By comparing malleabilityd) By comparing atomic weight