1. in a single atom, no more than 2 electrons can occupy a single orbital? a. true b. false
2. the maximum number of electrons allowed in a p sublevel of the 3rd principal level is?
a. 1 b.6 c. 2 d. 8 e. 3
3. a neutral atom has a ground state electronic configuration of 1s^2 2s^2. which of the following statements concerning this atom is/are correct? a. the atom has a total of two orbitals occupied. b. all of the above. c. the atom has no unpaired electrons. d. the atom contains 4 protons. e. the element has atomic number 4.

1.True

2.6

3.All of the above

Explanation:

1.In a single atom,  no more than 2 electrons can occupy a single orbital.

By pauli exclusion principle, an orbital can contain a maximum of only 2 electrons, the two electrons must have opposite spins.

Therefore, it is true.

2.We know that maximum number of electrons in p sublevel is 6.

Hence, the maximum number of electrons allowed in a p sublevel of the 3rd principle level is 6.

3.A neutral atom has a ground state electronic configuration of .

Therefore, Total number of electrons=4

Atomic number=4

Number of protons=Atomic number=4

The atom has  total number of orbital is 2.

The element has no unpaired electrons.

Hence, all of the above is correct option.

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