Advertisements
Advertisements
प्रश्न
Write the atomic number of the element present in the third period and a seventeenth group of the periodic table.
Advertisements
उत्तर १
There are two elements in the 1st period and eight elements in the 2nd period., The third period starts with the element with Z = 11. Now, there are eight elements in the third period. Thus, the 3rd period ends with the element with Z = 18 i.e., the element in the 18th group of the third period has Z = 18. Hence, the element in the 17th group of the third period has atomic number Z = 17.
उत्तर २
The element is chlorine (Cl) with atomic number (Z) = 17.
संबंधित प्रश्न
Use the periodic table to answer the following question.
Identify an element that would tend to gain two electrons.
Assign the position of the element having an outer electronic configuration in the periodic table.
(n - 2) f7 (n - 1)d1 ns2 for n = 6
Write the outer electronic configuration of the following using the orbital notation method. Justify.
Cu (belongs to period 4 and group 11)
Answer the following.
La belongs to group 3 while Hg belongs to group 12 and both belong to period 6 of the periodic table. Write down the general outer electronic configuration of the ten elements from La to Hg together using the orbital notation method.
Answer the following question.
The electronic configuration of some element is given below:
1s2
In which group and period of the periodic table the element is placed?
Answer the following question.
For s-block and p-block elements show that the number of valence electrons is equal to its group number.
Consider the oxides Li2O, CO2, B2O3.
Which oxide would you expect to be the most basic?
Consider the oxides Li2O, CO2, B2O3.
Which oxide would be the most acidic?
Consider the oxides Li2O, CO2, B2O3.
Give the formula of an amphoteric oxide.
How would you explain the fact that first ionisation enthalpy of sodium is lower than that of magnesium but its second ionisation enthalpy is higher than that of magnesium?
Justify the given statement with suitable examples— “the Properties of the elements are a periodic function of their atomic numbers”.
Write down the outermost electronic configuration of alkali metals. How will you justify their placement in group 1 of the periodic table?
The electronic configuration of Pt (atomic number 78) is ______.
E.N. of Si is ______. (Covalent radius of Si = 1.175 Å)
\[\ce{_92U^235}\] is a member of VI B group. The new element formed by the emission of α-particle will be a member of ______ group.
The IUPAC nomenclature of an element with electronic configuration [Rn] 5f146d17s2 is ______.
