Advertisements
Advertisements
Question
What is variable valency? Name two elements having variable valency and state their valencies.
Advertisements
Solution
Variable valency: Some elements exhibit more than one valency. They are said to have variable valency, e.g. Iron, copper, tin, lead.
Iron Fe Fe2+ or Fe3+
Copper cu cu+ or cu2+
APPEARS IN
RELATED QUESTIONS
Explain the Mass number with example.
Write true or false for the following statement
An atom on the whole has a positive charge.
Tick the most appropriate answer.
Which of these have similar chemical properties but different set of physical properties and mass number?
- isobars
- elements
- isotopes
- none of these
From the symbol `""_12^24"Mg"`
, state the mass number, the atomic number and electronic configuration of magnesium.
Name or state the following:
Elements having same mass number but different atomic number
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
Do isotopes have the same atomic number or the same mass number?
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Silicon [At. no. = 14, Mass no. = 28]
The Atomic number of an element is 20. It has ______ valence electrons.
If an atom has 6 electrons in its outermost shell, it is inert.
An element has 2 electrons in its N shell.
- What is its atomic number?
- State its position in the periodic table.
- Is it a metal or a non-metal?
- State the name assigned to this group.
- What is the valency of this element?
