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Check-in. Write the electron configuration for potassium, K. What would have to happen to a potassium atom for it to have a noble gas configuration? Explain. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1. It would need to lose 1 electron (then it would be like Argon). Check-in.

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slide1
Check-in
  • Write the electron configuration for potassium, K.
  • What would have to happen to a potassium atom for it to have a noble gas configuration? Explain.

1s22s22p63s23p64s1

It would need to lose 1 electron (then it would be like Argon)

slide2
Check-in

a) What is the charge on the Sn atom after 4 electrons have been removed?

b) Does Sn have a noble gas electron configuration once the 4 electrons have been removed?

+4

It doesn’t have the same # of electrons as a noble gas, but it still has 18 valence electrons!

slide3
HOMEWORK
  • 1. Which noble gas is closest to calcium, Ca, on the PT? What must happen to a calcium atom in order for it to have a noble gas electron configuration?

Argon, it must lose 2 electrons.

slide4
HOMEWORK
  • 2. When chlorine gains an electron to become a chloride ion with a -1 charge, it ends up with the noble gas electron configuration of argon. Why doesn’t it become an argon atom?

It still has 17 protons & the # of protons determines the type of element.

slide5
HOMEWORK
  • 3. Explain why the elements on the right hand side of the periodic table receive electrons instead of giving them up.

It is easier for these elements to gain electrons because they are closer to the noble gases on the right side of the PT.

slide6
Card Activity!

QUESTIONS TO ANSWER

List 3 patterns you notice

What happens to the charge on an atom when you remove electrons? Explain, mentioning protons.

What happens to the charge when you add electrons? Explain, mentioning protons.

slide7
Investigation 2.2.2 Activity!

Complete the table on page 19.

Answer Questions 1 & 2.

Answer questions a-j on page 21!

slide10
CHECK-IN:

Which elements will combine with Sr, strontium, in a one-to-one ratio?

Strontium loses 2 electrons and forms a +2 charge so any of the Group 6A elements (which gain 2 electrons to form a -2 charge) will combine with Strontium 1:1

slide11
Would you expect the following pairs of atoms to combine chemically to give an ionic compound? If yes, write the formula for the compound.

Li & S

O & S

Al & O

F & Cl

Li2S

Li+, S2-

N/A

O2-, S2-

Al2O3

Al3+, O2-

N/A

F-, Cl-

slide12
Would you expect the following pairs of atoms to combine chemically to give an ionic compound? If yes, write the formula for the compound.

I & K

H & N

Mg & F

Mg & Na

KI

I-, K+

N/A

H1-, N3-

MgF2

Mg2+, F-

N/A

Mg2+, Na+

slide13
Would you expect the following pairs of atoms to combine chemically to give an ionic compound? If yes, write the formula for the compound.

N & Al

Ca & Br

N3-, Al3+

AlN

CaBr2

Ca2+, Br-

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