chemistry orbital question?

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How many of these are true?1.The He atom has one electron each in 1s and 2s orbitals.2. The He atom has two electrons that have parallel spin in its 1s orbital.3. Electrons generally occupy the lowest energy orbital first.4.The C atom has two unpaired electrons.5. In the Li atom, the 3s, 3p, and 3d orbitals have different energies.6. The arrangement of the orbitals is the same in a multielectron atom and a single-electron atom.

Johathan Wehner · Accepted Answer

4 I think.1. false! in order to move up an energy level (at the very lowest orbitals when you get to 3d and 4s it swaps a bit) the lower orbital must be filled. In the case of an s orbital where there is space for 2 electrons there must be 2 in the 1s to have electrons in 2s so can’t have one in each.2.true! as I said in the last one, s orbitals have space for 2 electrons. These have an opposite ‘spin’ although you must be aware that the electrons don’t actually spin, it is a reference to their charge.3.true! um….yeah that’s all.4. I think false, a c atom has 12 electrons so 2 in N1, 8 in N2 and 2 in N3. the 2 in the outer level are not involved in bonding but they are not free radicals I think they would become a lone pair until they bonded, if they bonded, with something else.5. True! p has more energy than s and d more than p6. umm…wut? a single electron atom will still start with 1s orbital but as it has no more energy levels with have no more orbitals so in respect to how it fills i’d say yes…..

Johathan Wehner · Answer

1 is false. Helium has 2 electrons in the 1s orbital and none in the 2s.2 is false. Electrons can never have parallel spin in s-orbitals.3 is true, as the Aufbau Principle states.4 is true. Hund’s Rule states that orbitals are filled in singly before filling in pairs. Carbon is 1s² 2s² 2p², so the p-electrons are unpaired.5 is true. Each consecutive orbital in the same shell is higher in energy.6 is true, but the orbitals don’t always fill in in the same order. Palladium, for example, has no 5s electrons, even though 5s comes before 4d in energy.

Johathan Wehner · Answer

1 false, the 1s subshell has two spaces for electrons, so the two electrons in He will fill those, and have opposite spins.2 false according to the Pauli exclusion principle.3 true, electrons occupy the lowest energy orbital first. Each orbital can hold a maximum of two electrons of opposite spins. When more than one orbital of equal energy is available, electrons will first occupy these orbitals singly with parallel spins.4 true, the C atom has two unpaired electrons in its 2p subshell.5 true, in the case of a multielectron atom, the orbitals in a given principal shell have different energies6 false. The arrangement of the orbitals in a multielectron atom is different from the arrangement in a single-electron atom owing to the electron-electron repulsions in a multielectron atom.

Johathan Wehner · Answer

1. FALSE He only has electrons in its 1s orbital2. FALSE because The spin of an electron is denoted by a half arrow (single harpoon up). If the arrow heads point in the same direction, the electrons have parallel spin. Watch the animation to observe the arrangement of electrons in the He atom.3. TRUE4. TRUE 5. TRUE 6. FALSE because In a multielectron atom, there is a possibility of electron-electron repulsion

Johathan Wehner · Answer

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Johathan Wehner

chemistry orbital question?

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