Two elements whose symbols are derived from the first and third letter of the name are _____ and ______

Q. (a) Give two symbols which have been derived from the "English names" of the elements.
(b) Give two symbols which have been derived from the " Latin names" of the elements.

Q. The symbols used to denote different elements are generally the first or the first two letters of the name by which the particular element is commonly known. Which of the following elements do not fall in this category?
(a) Osmium
(b) Tungsten
(c) Silver
(d) Antimony

Q. The scientist who proposed the first letter (or first letter and another letter) of the Latin or English name of an element as its symbol, was :
(a) Dalton
(b) Proust
(c) Lavoisier
(d) Berzelius

Q. When a symbol is used to represent a unit named after a person, lower-case letters are used.

Q. In the following diagram for the first three periods of the periodic table, five elements have been represented by the letters a, b, c, d and e (which are not their chemical symbols):

(i) Select the letter which represents a halogen.
(ii) Select the letter which represents a noble gas.
(iii) What type of bond is formed between a and b?
​(iv) What type of bond is formed between c and b?
(v) Which element form a divalent anion?
Give reasons for your choices.