Elements P, Q dan R have 18, 19 and 20 protons respectively. It is found that the atomic size of P is the smallest. What is the factor that influences its size?

Element M forms ion M^2- with the electronic configuation 1s² 2s² 2p⁶ 3s² 3p⁶. Element N is located on the right and beside element M in the periodic table. Which of the following is the electronic configuration of valence shell of element N?

The locations for five elements in the periodic table are tabulated as follows:

Pick the element with the smallest atomic size.

The arrangement of ions Cl^-, K⁺ and Ca²⁺ in the order of increasing ionic radius is

The table shows the symbols representing elements and their respective proton numbers

Of the following arrangement, which one indicates the increasing order of atomic sizes of the elements in the above table?

Which of the following shows the increasing order of the atomic sizes of sulphur atom, S and its ions S^2-, S⁴⁺ and S⁶⁺?

Isoelectronic ions Mg²⁺, Al³⁺ and Si⁴⁺ have the ionic radii of 0.065nm, 0.050 nm and 0.041 nm respectively. The decline of ionic radii from Mg²⁺ to Si⁴⁺ indicates

Chloride ion Cl^- exhibits the same electronic structure as that of ;

[proton number: F 9; Ne 10; Na 11; Al 13; Ca 20]

Figure shows the position of four elements A, B, C and D in the periodic table

Arrange the elements in order of increasing atomic radius

Choose the correct order of increasing ionic radii from the sets below

Which species is very pleasant to release its electron?

Element with the greatest second ionisation energy is

Which of the species below has the highest ionisation energy?

The first seven ionisation enegies of element M are 786, 1577, 3229, 4356, 16080, 19790 and 23780 Kj mol^-1. In the periodic table, element M is in group

Of the following statements about the Periodic Table, which one is true?

Which property is increasing across period 3 from left to right?

An element has 6 electrons. The plot of successive ionisation energies against the number of electrons removed is as follows. Choose the correct graph for the element.

All of the following statements about group 2 elements are true EXCEPT

Two elements X and Y exhibit the following properties:

i. Elements X and Y can form ionic compounds of Na₂X and Na₂Y respectively.

ii. Element Y can form YF₆ but element X cannot form XF₆ molecule.

Of the following pairs of the valence electron configuration of X and Y, which one is correct?

The first ionisation of magnesium is smaller than that of nitrogen. Of the following statements, which one explains this statement?

[proton number : N 7; Mg 12]

The table shows the values of the first to the fifth ionisation energy of element X

The configuration of valence electrons of elements X is :

The figure shows a plot of successive ionisation energy of the first seven electrons of element J.

What would be the element J?

Of the following electronic configurations, which one has the largest ionisation energy?

Of the following statements about element ₂₆Y, which one is FALSE?

Element X has 20 protons in its nucleus. Pick a FALSE statement about that element

The following elements are from period 3 in the periodic table. Which element has the highest boiling point?

The electronic configuration of element Q is shown below

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d²

On moving across Period 3 (from sodium to chlorine)

Which of the following statements is true about flourine?