Name three metals whose symbols are derived from
the first letter of the name of the elementb] from their latin names
Explain the meaning of the term 'valency
sale why the valency of the metal potassium is +1 and of the non-metal chlorines
Sate the valency in each case and name the following elements or radicals given below
two have been done for you]
What is meant by the term 'symbol. Give the qualitative and quantitative meaning
What is meant by the term 'variable valency. Give a reason why silver exhibits a
Cheesamples of aght metals which show variable valency. State the valency of sulphur
Answers
Answer:
Q.1 Sodium (Symbol = Na) from Latin name "Natrium"
Iron (Symbol = Fe) from its Latin name “Ferrum”
Silver (Symbol=Ag) from its Latin name “Argentum”.
Q.2 Valency mean no. of electron(s) a element can give or accept for completing its octet .
Q.3 Valency of Potassium is +1 because it can give away or lose one of its electron can develop positive charge and complete its Octet.
Valency of Chlorine is -1 because it can accept electron and develop negative charge and complete its Octet.
Q.4 Question is incomplete.....
Q.5 'Symbol' is the representation of an element using 1-2 letters that is unique to each element. For ex. Cu for Copper, Co for Cobalt
Q.6 'Variable Valency' means when a single element exhibits more than one valency.
Silver can sometimes lose more electrons than are present in its valence shell i.e. loss from the penultimate shell and hence exhibits variable valency. Hence, its valency is either 1 or 3.
Sulphur exhibits variable valency of 2, 4 and 6 because of the presence of d -orbitals in sulphur