Chemistry Module 3 - part 1

An atom's valence electrons are located in the atom's outermost energy level.

• True

• False

An atom has the following electron configuration.

1s²2s²2p⁶3s²3p³

How many valence electrons does this atom have?

• 3

• 5

• 8

• 15

An atom's Lewis dot structure has two dots. Which of the following elements could it be, and why?

• Calcium, because it is an alkaline earth metal with two inner shell electrons.

• Carbon, because it has two electrons in its outermost p sublevel.

• Lithium, because it is a group 1 element with two bonding electrons.

• Magnesium, because it is a group 2 element with two valence electrons.

Match each element to the number of electrons in its valence shell.

Hydrogen (H)

• one

• two

• four

• eight

Match each element to the number of electrons in its valence shell.

Carbon (C)

• one

• two

• four

• eight

Match each element to the number of electrons in its valence shell.

Oxygen (O)

• one

• two

• four

• six

Match each element to the number of electrons in its valence shell.

Magnesium (Mg)

• one

• two

• four

• six

The electron configuration of an element is 1s²2s²2p⁶3s¹. Describe what most likely happens when an atom of this element comes near an atom having seven valence electrons.

• They will most likely have a ionic bond as the element stated will pass it's outermost electron to the element with the seven valence electrons.

• done reading

What type of ions do nonmetals naturally form?

• Positive ions, by gaining electrons to fill the valence shell

• Positive ions, by losing electrons to empty the valence shell

• Negative ions, by gaining electrons to fill the valence shell

• Negative ions, by losing electrons to empty the valence shell

What is the formula of the compound formed between chlorine (Cl) and calcium (Ca)?

• CaCl, because calcium loses one electron and chlorine gains one electron.

• ClCa, because chlorine gains one electron and calcium loses one electron.

• CaCl₂, because calcium loses two electrons and chlorine gains one electron.

• ClCa₂, because chlorine gains one electron and calcium loses two electrons.