The main group elements complete their elctron configuration using s and p electrons in the periodic table. These elements range from the most metallic to the most non-metallic , with intermiediate properties of semi-metals, in between . The elements which occur at the two extremes of the periodic table are highly reactive and therefore , these highly reactive elements do not occur in free state, they usually occur in the combined forms.
Which of the following properties show opposite trend on moving along a period from left to right and from top to bottom in a group ?

Options

A. Atomic radius and electron gain enthalpy (negative value)
B. Nuclear charge and ionisation enthalpy
C. ionisation enthalpy and electron gain enthalpy (negative value)
D. None of the above

Answer

A