Number 15. I am told the answer is A and I don't understand why. I think I understand the concepts but have trouble interpreting this data. ### Transcription for Educational Website:#### Questions and Data Interpretation:**Question 13:**An element X has the ground-state valence electron configuration of ns²np³. The formula for the compound composed of element X and nitrogen is most likely:- (A) NX- (B) NX₂- (C) NX₃- (D) NX₅**Correct Answer:** C (circled)**Question 14:**When placed in order of increasing ionization energy, what is the correct order for the species O, O⁺, and O⁻?- (A) O, O⁺, O⁻- (B) O⁻, O⁺, O- (C) O⁺, O, O⁻- (D) O⁻, O, O⁺**Correct Answer:** D (circled)**Question 15:**The table below shows the first eight ionization energies for four random elements from the second and third periods of the periodic table. Based on these data, which elements would most likely have similar chemical properties?| Ionization Energy (kJ/mol) | Elements | | ||:---------------------------:|:--------:|---:|---:|| | W | X | Y | Z || First | 1,314 | 1,000 | 578 | 496 || Second | 3,388 | 2,252 | 1,817 | 4,562 || Third | 5,301 | 3,357 | 2,745 | 6,910 || Fourth | 7,469 | 4,556 | 11,577 | 9,470 || Fifth | 10,990 | 7,004 | 14,842 | 13,354 || Sixth | 13,327 | 8,496 | 18,379 | 16,613 || Seventh | 71,330 | 27,107 | 23,326 | 20,117 || Eighth | 84,078 | 31,719 | 27,465 | 25,496 |**Options:**- (A) W and X- (B) W and Y- (

The quantity of energy that an isolated, gaseous atom in the ground electronic state must absorb to remove an electron, resulting in a cation is called its ionisation energy. This energy is usually expressed in kJ/mol. The more electrons lost, the more positive the ion will be and the harder it is to separate the electrons from the atom. Ionization energies depends upon the atomic radius. On moving from right to left on the periodic table, the atomic radius increases, and the ionization energy increases from left to right in the periods and up the groups. Of the given elements the ionisation energy of W and X shows a periodical trend in their values but the other elements does not. There is a periodical change in the subsequent ionisation energies. The difference between the adjacent energies if the elements are almost similar, Hence their properties.