Periodic Table and Valence Electrons

What are valence electrons?

• The # of electrons in the atom

• The # of electrons in the outermost shell

• The # of electrons an atom will pick up

• The # of electrons an atom will get rid of

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What is an ion? (general definition)

• An element with a neutral charge

• An element that has gained an electron

• An element that has gained or lost an electron

• An element that has lost an electron

Select all that apply

• An anion loses electrons

• A cation loses electrons

• A cation is positive

• An anion is positive

Anions are generally found where in the Periodic Table?

• Alkali Earth Metals

• Noble Gases

• Transition Metals

• Nonmetals

Chlorine (atomic# 17) is more likely to:

• Become a cation

• Become an anion

• Stay neutral

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Use the Periodic Table

Select all elements that will have a +2 ion

• Oxygen

• Beryllium

• Magnesium

• Calcium

• 2
• 8
• 3
• 13

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• 12
• 7
• 8
• 14

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USE THE PERIODIC TABLE

How many valence electrons does sodium have?

• 1

• 2

• 3

• 4

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NGSS.HS-PS1-1

USE THE PERIODIC TABLE

How many valence electrons does Phosphorus have?

• 31

• 5

• 15

• 4

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