Question

with respect to mordern periodic table answer the following
1.what is a period?
2.what is perodic?
3.what is a group?
4.what is A group called?
5.what is B group called?
4.why are some elements of group B written down in f block? ? give reason

Answer 1

Ans 1):- There are 7 horizontal rows in modern periodic table They are known as periods.
Ans 2):- The properties that reappear at regular intervals, or in which there is gradual variation at regular intervals, are called ' periodic properties' and the phenomenon is known as the periodicity of elements.
Ans 3):- A group is determined by the number of electrons in the outermost shell.
Ans 4):- Normal elements.
Ans 5):- Transition elements.