In question 27 , it is asked to find the element which is a metalloid . Now there are about 7 metalloids , if any of the metalloids is asked what will i do ? I mean till which point the elements with atomic numbers must be memorised? I know till 20.
Q.27. Consider the part of periodic table given below and answer the following questions.

(i) The atom of which element is smaller in size e or h?
(ii) Which element is the most electropositive in nature?
(iii) Which element has only one proton in its atom?
(iv) What is the valency of g?
(v) How many valence electrons does g have?
(vi) Name the element which is a metalloid.