Question

Question 3.27 Use the periodic table to answer the following questions.

(a) Identify an element with five electrons in the outer subshell.

(b) Identify an element that would tend to lose two electrons.

(c) Identify an element that would tend to gain two electrons.

(d) Identify the group having metal, non-metal, liquid as well as gas at the room temperature.

Class XI Classification of Elements and Periodicity in Properties Page 94

Answer 1

(a) General electronic configuration of elements having five electrons in the outer subshell is ns²np⁵ . this configuration belongs to 17th group ( halogens family ) .
e.g., F , Cl , Br , I , At

(b) elements of 2nd group have tendency to lose two electrons . e.g., Mg, Ca, Sr , Ba etc

(c) elements of 16th group have tendency to gain two electrons . elements are O, S , Se etc

(d) 1st or 17th group of the periodic table contains metal, non- metal , liquid as well as gas at room temperature.
in 1st Group, H is non - metal and gas at room temperature while all other elements of this group are metals . and Cs is liquid metal.
in 17th group , Br is liquid non - metal while other elements of this group are gaseous non - metals . I shows metallic character.

Answer 2

Answer:

a answer is nitrogen because it is in 15 group. 2-carbon or magnesium 3- oxygen