Advertisements
Advertisements
Question
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
Solution
With 4 shells T belong to period 4.
RELATED QUESTIONS
Fill in the following blank with suitable word:
Group 1 elements are called ...............
Consider the following elements:
Ca, Cl, Na, I, Li, Ba, Sr, K, Br
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
Consider the following elements:
20Ca, 8O, 18Ar, 16S, 4Be, 2He
Which of the above elements would you expect to be:
(i) very stable?
(ii) in group 2 of the periodic table?
(iii) in group 16 of the periodic table?
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
How does the property vary in periods and in groups?
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
- Write the electronic configuration of element X, given by its symbol as under: \[\ce{^40_20 X}\]
- Determine its position in the modem periodic table.
- What is the nature of its oxide?
- Name one other element of its group.
