Electrons Review - Swain

What do the direction of the arrows mean in e- configuration?

• electrons spin in opposite directions

• electrons are in the protons

• neutrons are located outside the nucleus

• valence electrons are always filled

2s1

• Lithium (Li)
• Beryllium (Be)
• Sodium (Na)
• Potassium (K)

Tags

NGSS.MS-PS1-1

3s2

• Magnesium (Mg)
• Sodium (Na)
• Aluminum (Al)
• Calcium (Ca)

Tags

NGSS.HS-PS1-1

4s1

• Sodium (Na)
• Magnesium (Mg)
• Potassium (K)
• Calcium (Ca)

6s2

• Barium (Ba)

• Aluminum (Al)
• Sodium (Na)
• Calcium (Ca)

Tags

NGSS.MS-PS1-1

3d6

• Calcium

• Neon

• Manganese

• Iron

4d9

• Gold

• Silver

• Mercury

• Cadmium

2p2

• S

• Si

• O

• C

Tags

NGSS.MS-PS1-1

4p5

• Krypton

• Bromine

• Sulfur

• Iodine

Tags

NGSS.MS-PS1-1

How many electrons does this element have?

• 16

• 15

• 5

• 2

Tags

NGSS.MS-PS1-1