Identify the correct order of acidic strengths of $CO_2, CuO, CaO, H_2O:-$

The atomic numbers of the metallic and non-metallic elements which are liquid at room temperature respectively are

In a periodic table, how does the basic character of oxides vary?

Identify the group and valency of the element having atomic number $119$. Also,predict the outermost electronic configuration and write the general formula of its oxide.

Observe the following data ($ \Delta_i H_1, \Delta_i H_2 $ and $ \Delta_{eg} H $ represent the first,second ionisation enthalpies and electron gain enthalpy respectively).

Element	$ \Delta_i H_1 $ $( kJ \ mol^{-1} )$	$ \Delta_i H_2 $ $( kJ \ mol^{-1} )$	$ \Delta_{eg} H $ $( kJ \ mol^{-1} )$
$ I $	$ 520 $	$ 7300 $	$ -60 $
$ I.I $	$ 490 $	$ 3051 $	$ -48 $
$ III $	$ 1681 $	$ 3374 $	$ -328 $
$ IV $	$ 2372 $	$ 5251 $	$ +48 $

Using the data,identify the most reactive metal.

Which of the following electronic configurations represents a coinage metal?