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The statement that an electron occupies the lowest available energy orbital is

• Hund's Rule

• AUfbau principle

• Bohr's law

• The Pauli Exclusion principle

The atomic sublevel with the next highest energy after 4p is

• 4d

• 4f

• 5s

• 5p

In the electron configuration for scandium (atomic number 21), what is the notation for the three highest-energy electrons?

• 4s2, 3d1

• 3d3

• 4s3

• 4s2 4p1

How many electrons can the first energy level hold?

• 1
• 2
• 8
• 0

Which two particles are contained in the nucleus of an atom?

• Protons and Neutrons

• Protons and Electrons

• Electrons and Neutrons

Haw many maximum electrons can be present in the "M" shell of an atom?

• 2

• 8

• 18

• 32

An atom has atomic number 4 the number of electrons in its outermost orbit will be ?

• 2

• 6

• 4

• 1

How many energy shells/levels does this atom have?

• 1

• 2

• 3

• 4

The electron configuration of an atom is $1s^22s^22p^6$ The number of electrons in the atom is 

• 3

• 5

• 6

• 10

An orbital can at most hold how many electrons?

• 1 electron

• 2 electrons

• 3 electrons

• 4 electrons