OBJ 4.1-4.3 Periodic Table & Bohr Electrons

Periodic Table & Bohr Electrons

OBJ 4.1-4.3

Multiple Choice

On the periodic table the horizontal rows (going left-right) are called

• groups

• periods

Multiple Choice

On the periodic table the vertical columns (going up & down) are called

• groups

• periods

Periodic Table

• In another tab open the PTable

• You will need it for the next questions

• Example question: Which element is in period 2 and group 5A?

• Same Q: What element has 2 occupied energy levels, 5 valence electrons

Multiple Choice

Which element is in period 3 and group 4A?

• Ga

• V

• Si

• Ge

Multiple Choice

Which element is in period 5 and group 7A?

• At

• I

• Os

Poll

Build an atom: How many electrons could fit in the first orbital n=1?

• 0

• 2

• 4

• 6

• 8

Open Ended

How many do you think can fit in the second orbital n=2?

Third orbital?

Fourth orbital?

Write the Bohr electron notation for

• Hydrogen; Number of Protons = 1 = Number of electrons

• Bohr electron notation H: 1

• Carbon

• Number of Protons = 6 = Number of electrons

• First orbital = 2 e-

• Second orbital = 4e-

• Bohr electron notation C: 2-4

Write the Bohr electron notation for

• Magnesium

• Number of Protons = 12 = Number of electrons

• First orbital = 2 e-

• Second orbital = 8 e-

• Third orbital = 2 e-

• Mg: 2-8-2

Multiple Choice

What is the Bohr electron notation for fluorine (F = 9 electrons)?

• 9

• 1-8

• 2-7

• 7-2

• 3-3-3

Multiple Choice

What is the Bohr electron notation for sulfur (S = 16 electrons)?

• 8-8

• 2-14

• 2-8-6

• 8-2-6

• 4-4-4-4

Multiple Choice

What is the Bohr electron notation for lithium (Li = 3 electrons)?

• 2-1

• 3

• 1-2

• 0-3

Multiple Choice

What is the Bohr electron notation for argon (Ar = 18 electrons)?

• 8-10

• 2-16

• 2-4-12

• 2-8-8

Calcium

20 electrons

2-8 then....

2-8-8-2

Period 4, four filled energy levels