Advertisements
Advertisements
Question
An element has 2 electrons in its N shell.
State its position in periodic table.
Advertisements
Solution
Electronic configuration of the element is:
| K | L | M | N |
| 2 | 8 | 8 | 2 |
∴ Position in the periodic table is the 4th period. (Four shells).
RELATED QUESTIONS
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
How were the positions of isotopes of an element decided in the modern periodic table?
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
What is the number of valence electrons in the atoms of first elements in a period?
What is the number of elements in the 3rd period, of the modern periodic table?
Two elements P and Q belong to the same period of the modern periodic table and are in group 1 and group 2, respectively. Compare the following characteristics in the tabular form.
- Number of electrons in their atoms
- Their tendency to lose electrons
- Their metallic characters
- Formation of their oxides
- Formulae of their chlorides
Give the symbol and valency of the following element and radical.
Aluminium
Give the chemical formula of ammonium sulphate
Element ‘X’ forms a chloride with the formula XCl2, which is solid with a high melting point. X would most likely be in the same group of the periodic table as: ______
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
