Sunday, May 29, 2011


1. Table 1 shows the relative atomic mass, number of neutrons and number of electrons of particles T, U, V, W, X and Y.

Particles T U V W X Y
Relative atomic mass 19 24 27 31 35 38
Number of neutrons 10 12 14 16 18 20
Number of electrons 10 10 13 15 17 18

Table 1
Jadual 1

(a) Choose a particle which is
(i) An atom of a metal
(ii) An atom of a non-metal
(iii) An anion
(iv) A cation

(b)Why is the particle stated in (a) (iii) is an anion?

(c)Choose an element which is chemically inert.

(d)Element V can combine with element X to form a compound. What is the formula of the compound formed?

(e)Choose two particles that can combine to form a compound which can conduct electricity in molten state.

(f)Which element exists as diatomic molecule? Name the chemical bond that exists in this molecule.