Which of the following is not a possible sublevel? 1p 2s 3d 4f

1p is not possible because it goes like this 1s2 2s2 2p6

Answer is: 1p.

First energy level only have one sublevel 1s.

Second energy level has 2s and 2p, third has 3s, 3p and 3d and fourth has 4s, 4p, 4s and 4f.

Aufbau principle is a scheme used to reproduce the electron configurations of the ground states of atoms by successively filling subshells (orbitals) with electrons in a specific order.

Filling subshells in the following order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f.

38.588 g ≅ 35.60 g.

Explanation:

From the balanced equation: 2Na + Cl₂ → 2NaCl,It is clear that 2.0 mole of Na reacts with 1.0 mole of Cl₂ to produce 2.0 mole NaCl.The no. of moles of Na metal reacted = mass / atomic mass = (17.25 g) / (22.989 g/mol) = 0.75 mol.

Using cross multiplication:

2.0 moles of Na metal produce → 2.0 moles of NaCl,

∴ 0.75 mole of Na metal produce → 0.75 mole of NaCl.

The calculated (theoretical) yield of NaCl = n x molar mass = (0.75 mol)(58.44 g/mol) = 43.85 g.

∵ The percentage yield = [(actual yield) / (calculated yield)] x 100.

∴ The actual yield = [(the percentage yield)(calculated yield)] / 100 = [(88 %)(43.85 g)] / 100 = 38.588 g ≅ 35.60 g.