Symbols of Elements and Their Valencies
Trending Questions
Q.
What do the following symbols stand for ?
(a) H (b) H2 (c) 2H.
Q.
What is a symbol? What information does it convey?
Q.
Why is the symbol S for sulphur, but Na for sodium and Si for silicon ?
Q.
If the symbol for Cobalt, Co, were written as CO, what would be wrong with it?
Q.
Write the full form of IUPAC. Name the elements represented by the following symbols :
Au, Pb, Sn, Hg.
Q. (1) What is an atomic symbol?
(2) Write the symbols of the following elements:
Chlorine, Carbon, Oxygen, Aluminium
(2) Write the symbols of the following elements:
Chlorine, Carbon, Oxygen, Aluminium
Q. Assertion (A): Iron is represented by the symbol ‘Fe’.
Reason (R): The chemical symbol of iron is derived from its Latin name.
Reason (R): The chemical symbol of iron is derived from its Latin name.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is not the correct explanation of A
- Both A and R are false
- A is true but R is false
Q. Some elements and their valencies are given:
Write the chemical formula of barium chloride.
Write the chemical formula of zinc oxide.
The chemical formula of calcium oxide is CaO. What is the valency of Ca?
Elements | Valency |
Ba | 2 |
Cl | 1 |
Zn | 2 |
O | 2 |
Write the chemical formula of zinc oxide.
The chemical formula of calcium oxide is CaO. What is the valency of Ca?
Q.
If the symbol for Cobalt, Co, were written as CO, what would be wrong with it?
Q.
Which of the following is correct regarding Ca2+ ?
All of the options are correct
Valency of calcium is 2
It is a cation
Calcium
Q. The number of protons, electrons and neutrons in the nucleus of 13Al27 is
- 13, 13, 14
- 14, 14, 13
- 14, 0, 13
- 13, 0, 14
Q. Assertion (A): Iron is represented by the symbol ‘Fe’.
Reason (R): The chemical symbol of iron is derived from its Latin name.
Reason (R): The chemical symbol of iron is derived from its Latin name.
- Both A and R are false
- Both A and R are true but R is not the correct explanation of A
- Both A and R are true and R is the correct explanation of A
- A is true but R is false
Q. Atomic nuclei are typically written in the form AZX. Identify Which letter represents the protons plus neutrons in the nucleus?
- The number of protons is Z
- The number of neutrons is X
- The symbol of the element is X
- The mass number is A
- The number of electrons is A
Q. The valency of calcium in calcium hydroxide is ___ .
Q. Atomic nuclei are typically written in the form AZX.Identify number of protons in X.
- The number of neutrons is X
- The number of protons is Z
- The symbol of the element is X
- The mass number is A
- The number of electrons is A
Q. The chemical formula of magnesium sulphide is .