Which of the following statements is not correct?

1.  The first ionization energy generally decreases from top to bottom within a group

2.  The atomic radius generally increases from top to bottom within a group

3.  The first ionization energy generally decreases from left to right across a period

4.  The second ionization energy of an atom is always greater than the first ionization energy

What is the general trend observed for the first ionization energies of the elements in groups 13to 17?

1.  Ionization energies tend to increase from left to right in a period and are approximately constant in a group

2.  Ionization energies tend to increase from left to right in a period and decrease from top to bottom in a group

3.  Ionization energies tend to decrease from left to right in a period and increase from top to bottom in a group

4.  Ionization energies tend to decrease from left to right a period and decrease from top to bottom in a group

Which of the following pairs of substances are allotropes?

1.  ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{CH}}_3{\mathrm{OCH}}_3$

2.  $\mathrm{Fe}{\left({\mathrm{NO}}_3\right)}_2<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>\mathrm{Fe}{\left({\mathrm{NO}}_3\right)}_3$

3.  NaCl and KCl

4.  ${\mathrm{O}}_2<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{O}}_3<mspace\; width="1em"></mspace>$

 Element 114 is most likely to be a

1.  Reddish-brown volatile liquid

2.  A pale yellow-green gas

3.  A colourless crystal

4.  A grey-silvery metal

Which gas-phase atom has the largest radius?

1.  Na

2.  K

3.  Mg

4.  Ca

Which of the following is the correct increasing order of atomic radii of Be, B, Mg, and Al?
 

1.  Be < B < Mg < Al

2.  Mg < Be < Al < B

3.  B < Be < Al < Mg

4.  Al < Mg < B < Be

What property of the oxygen atom is represented by the equation : $O\left(g\right)+e^{-}\to O^{-}\left(g\right)$?

1.  Electronegativity

2.  First electron affinity

3.  First ionization energy

4.  Lattice energy

Which of the following isoelectronic species has the largest radius?

1.  $K^{+}$

2.  $C{a^2}^{+}$

3.  $P^{3-}$

4.  $S^{2-}$

Which group best illustrates the transition from non-metallic to metallic behavior with increasing atomic number?

1. Be, Mg, Ca, Sr

2. N, P, As, Sb

3. F, Cl, Br, l

4. Fe, Ru, Os, Hs

The ionisation energy will be maximum for the process:

1. $Ba\to B{a}^{2+}$

2. $Be\to B{e}^{2+}$

3. $Cs\to C{s}^{+}$

4. $Li\to L{i}^{+}$