Question 1

Which element  has 2 electrons in its outer shell and does not conduct electricity?

Accepted Answer

Helium

Answer

Magnesium

Answer

Sodium

Answer

Aluminium

Question 2

Which two first row d-block elements do not have the Aufbau predicted electronic configurations?

Accepted Answer

Chromium and Copper

Answer

Scandium and Zinc

Answer

Scandium and Chromium

Answer

Titanium and Chromium

Question 3

Which elements are not first row transition elements but are d- block elements?

Accepted Answer

Scandium and Zinc.

Answer

Copper and Chromium.

Answer

Copper and Titanium,

Answer

Manganese and Titanium.

Question 4

How does the first ionisation energy of oxygen compare with that of nitrogen and why is this the case?

Accepted Answer

Lower, as the electron being removed  is paired with another electron in the same orbital.

Answer

Higher, as the electron  being removed  is closer to the nucleus.

Answer

Higher, as the electron being removed  is further from the nucleus

Answer

Lower, as the electron being removed is not paired with another electron in the same orbital.

Question 5

How does the second electron affinity of oxygen compare with the first and why is this the case

Accepted Answer

The second electron affinity is endothermic as an electron is added to a negative ion  in this process.

Answer

The second electron affinity is exothermic as an electron is added to a positive ion  in this process.

Answer

The second electron affinity is exothermic as an electron is added to a negative ion  in this process.

Answer

The second electron affinity is endothermic as an electron is added to a positive ion  in this process.

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