The following table gives the atomic numbers of elements V, W, X, Y and Z.
Element
V
W
X
Y
Z
Atomic number
11
16
18
19
24
(a)Which of the elements: (i) belong(s) to group 1? (ii) is/are riotle gas(es)? (iii) form(s) coloured compound(s)? (iv) form(s) an anion? (v) react(s) with water to liberate hydrogen? (vi) react(s) with water to form alkaline solution?
(b) What is the: (i) charge on the ion formed in (a)(iv) above? (ii) group of the element(s) in (a)(i) above?
(c)(i) Write the formula of the compound formed between element V and element W. (ii) Sate the type of bond formed in (c)(i) above. Explain your answer. (d)(i) What is a covalent compound? (ii) Give two factors that influence covalent bonding. (iii) State the type of bond that exists in each of the following substances: MgO, NH\(_3\) and Fe. (iv) What are intermolecular forces?
Explanation
(a)(i) V and Y (ii) X (iii) Z (iv) W (v) V and Y (vi) V and Y
(b)(i) — 2 or 2— (ii) Akali metals
(c)(i) V\(_2\) W (ii) Bond — ionic / electrovalent V can readily lose its electron W can readily accept electrons to attain stability.
(d)(i) A ccmpond formed by two atoms which donate equal no of electrons that are shared between them such that each achieves a stable octet. (ii) * electronegativity (difference) * ionization energy * electron affinity (iii) MgO — ionic / eiectroyalent NH\(_3\) — covalent Fe — metallic (iv) Intermolecular forms. are attractive forces that operate between molecules and influence the properties of the substance.
