what is the valence electrons for carbon with 6 electrons? 1s2 2s2 2p2

• 2

• 6

• 4

• 3

what is the valence electrons for phosphorus in group 15?

• 15

• 5

• 3

• 2

calcium is in group 2 of the periodic table. what is the valence electrons?

• 12

• 2

• 18

• 0

nitrogen has 7 electrons. what is the electron configuration?

• 1s2 2s1 2p4

• 1s2 2s2 2p3

• 1s1 2s1 2p5

• 1s2 2s5

how many electrons can get into one orbital?

• 1

• 6

• 2

• 4

fluorine has 9 electrons. what is the electronic configuration?

• 1s2 2s2 2p1 3s4

• 1s2 2p6 3s1

• 1s1 2s3 3p5

• 1s2 2s2 2p5

which rule says electrons fill orbitals from the lower energy to higher energy?

• pauli exclusion principle

• hund's rule

• aufbau principle

• none of these

which rule says that electrons must occupy orbitals with opposite spin?

• aufbau principle

• pauli exclusion principle

• hund's rule

• none of these

what is the valence electrons of an element in group 17?

• 7

• 17

• 1

• 5

which element has the highest valence?

• 1s2 2s2

• 1s2 2s2 2p1

• 1s2 2s2 2p6 3s2

• 1s2 2s2 2p5