Reminders/Info Quiz tomorrow – Metals, nonmetals, metalloids, electron configuration, valence electrons, electron dot structures Homework due Friday at the beginning for raffle chance Friday you will be able to do makeup work in class – bring your textbook
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Reminders/Info Quiz tomorrow – Metals, nonmetals, metalloids, electron configuration, valence electrons, electron dot structures Homework due Friday at.
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Reminders/InfoQuiz tomorrow – Metals, nonmetals,
metalloids, electron configuration, valence electrons, electron dot structures
Homework due Friday at the beginning for raffle chance
Friday you will be able to do makeup work in class – bring your textbook
Can you do this?
Explain why atoms are neutral in charge.
HINT: think about the charges and numbers of the subatomic particles
Atoms have equal numbers of protons and electrons
Protons and electrons have opposite charges
Equal and opposite charges cancel out
12-15-10Cornell Notes
A single atom or groups of atoms with either a positive or negative charge.
Cation: positively charged ion
Anion: negatively charged ion
Ions form when atoms lose or gain valence electrons.
Lose electrons = Make a CATION
Gain electrons = Make an ANION
Na Na+
Atoms lose, gain or share electrons in order to acquire the stable electron configuration of a noble gas.
Lose all valence electrons, or gain electrons until it has 8
Na Cl+ Na+ Cl+-
Cation,Like Ne
Anion,Like Ar
Groups 1 to 4 give their valence electrons away
12 13 14
Li Li+
Mg Mg2+
B B3+
Groups 5 to 7 take electrons
5 67 P P3-
O O2-
F F-
Group 8 doesn’t form ions (noble gases)They already have the lucky 8 electrons!
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What would be the ion for Calcium (Ca)?
Group
Gain/Lose electrons
Charge
2
Lose
2+
IonCa2+
# valence electrons 2
What would be the ion for Boron (B)?
Group
Gain/Lose electrons
Charge
3
Lose
3+
IonB3+
What would be the ion for Phosphorus (P)?
Group
Gain/Lose electrons
Charge
5
Gain
3-
IonP3-
1. For each element, identify: The group Whether the element gains or loses electrons The charge of the ion The written form of the ion
2. You may work in groups
3. 2 bonus points if you get all the answers correct