Question

Use the letters only written in the Periodic Table given below to answer the questions that follow:

(a) State the number of valence electrons in the atom J.(b) Which element shown forms ions with a single negative charge?
(c) Which Metallic element is more reactive than R?
(d) Which element has its electrons arranged in four shells?

Answer 1

(a) The element J is placed in the 5^th group; hence, its number of valence electrons is 5.
(b) The element M which is placed in the 7^th group has 7 valence electrons and will gain only one electron to complete its octet; hence, element M will show a single negative charge.
(c) Element T is more reactive than element R because chemical reactivity increases down the group.
(d) Only element T is placed in the 4^th period; hence, its electrons are arranged in four shells.