Name _______________________

Date ________

Block ________

Electrons – Life on the Edge

Chem Catalyst:

Draw Bohr Models of Lithium (Li), Sodium (Na), and Potassium (K).

What parts of the atom might account for the fact that they all behave in very similar ways?

New Information:

Electrons in atoms are divided into 2 groups. Valence electrons are those in the outer shell. Core electrons are all those buried in the middle. As you may have deduced from the chem. catalyst, the valence electrons are the important ones. It is the valence electrons that determine how an atom will react.

Scan and insert “life on the edge” questions here.

Chem Catalyst 2:

The following is a drawing of how the electrons in Scandium are distributed. Is this what you expected? Why or why not?

2e^- 8e^- 9e^- 2e^-

New information:

Hopefully the 9 electrons in row 3 were a surprising to you. Let’s figure out why that happens.

The middle block of elements (columns IIIB- IIB) is called the D block. Through the oddness of energy, we have discovered that the electrons from these blocks are bashful and hide inside the atom. Some of these electrons are valence and some are not. What this means for you is that YOU WILL NEED TO MEMORIZE THE VALENCE ELECTRONS FOR THE D BLOCK ELEMENTS WE USE MOST.

Homework:

Draw every atom in rows 1-4.

Electron Notes

4 Blocks of the periodic table _______, _______, _______, _______.

Explain where each is located.

VALENCE ELECTRONS:

CORE ELECTRONS:

D block

Example Problem: How many valence electrons are in an atom of carbon?

Carbon has _______ electrons.

Core electrons?

Count elements?

Where are those electrons?

Are they valence?

Ex 2: How many valence electrons are in Ga?

Galium has _______ electrons.

Row 1 has

Row 2 has

Row 3 has

Row 4 has

That leaves _______ valence electrons in Galium.

THE ROMAN NUMERAL

Ex. Carbon is in column _________

_____ is the roman numeral_______, carbon has _______ valence electrons.

THIS ONLY WORKS FOR…