Term 1 Week 7 questions Grade 12 SABIS

an orbital that has the most number of electrons spinning:

• A

• B

• C

• D

• E

the outermost orbital:

• A

• B

• C

• D

• E

the orbital that is subjected to the strongest nuclear attractions

• A

• B

• C

• D

• E

In general, going across a row in the periodic table from left to right, the first ionization energy of the elements increases. Specify the correct reason(s) for this trend. Select all that apply.

• The distance between the nucleus and the outermost electron is similar.

• The nuclear attractions are weakened by the extra electrons.

• The nuclear repulsions are strengthened by the core electrons.

• The shielding effect decreases.

• The nuclear charge increases.

In general, the first ionization energy of the elements decreases, as we go down a group in the periodic table. Specify the correct reason(s) for this trend. Select all that apply.

• The average distance between the nucleus and the outermost electron increases.

• The shielding effect increases leading to weaker attractions between the nucleus and the valence electrons.

• The nuclear attractions applied on the outermost electron are weakened by the valence shells.

• The nuclear repulsions are strengthened by the protons.

• The nuclear charge decreases.

The first ionization energy of a gallium atom  is less than that of a calcium atom .The reason is that the outermost electron in a gallium atom is **** penetrating towards the nucleus, so it is subjected to **** shielding by the 4s electrons, and **** nuclear attractions, compared to the outermost electron in a calcium atom.

• less

  more

  less

• more

  less

  more

• less

  less

  more

• more

  more

  less

The first ionization energy of an oxygen atom  is less than that of a nitrogen atom .Which of the following statements explain this observation? Select all that apply.

• Extra repulsion by the nucleus in oxygen makes it easier to remove the outermost electron.

• The outermost electrons in a nitrogen atom is subjected to less repulsion than that in an oxygen atom.

• The double-occupied 2p orbital in oxygen increases the nuclear attractions.

• The electrons in the double-occupied 2p orbital in oxygen are subjected to extra repulsion.

• The shielding effect in the oxygen atom makes it easier to remove the outermost electron.

Electronic configuration of Vanadium V3+

• 1s2 2s2 2p6 3s2 3p6 4s2 3d3

• 1s2 2s2 2p6 3s2 3p6 4s2

• 1s2 2s2 2p6 3s2 3p6 3d2

• 1s2 2s2 2p6 3s2 3p6 3d5

Calculate the energy of a photon whose frequency is 6.11 X10 ¹⁴Hz.

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Which group Element X belongs to?

• Two

• Three

• Four

• Five