Fill in the blanks: Periods are _ [5, 6, 7] horizontal rows of elements in the periodic table and an element with three electron shells and two electrons in its valence shell belongs to period [6, 3, 1] and group [3, 6, 2].

Open in App

Solution

There are seven periods in the periodic table. Each period consists of a series of elements having same valence shell. Each period corresponds to a particular principal quantum number of the valence shell present in it.
There are eighteen groups. Group consists of a series of elements having similar valence shell electronic configuration.
An element with three electron shells and two electrons in its valence shell belongs to period 3 and group 2.

Suggest Corrections

Similar questions

Q. Fill in the blanks
The elements present in horizontal rows of a periodic table have same valence shell.

Q. An element

A

belongs to third period and second group of periodic table. The number of valence electron/electrons of element

A

Fill in the blanks in the following statements :

(a) The horizontal rows in a periodic table are called .............

(b) In going across a period (right to left) in the periodic table, the atomic size of the atom .............

(d) When we down in a group in the periodic table, the metallic character of elements ..............

(e) The tendency to gain an electron ................ on moving down in a group of the periodic table.

Question 33
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.

Which element has

(a) two shells, both of which are completely filled with electrons?

(b) the electronic configuration 2, 8, 2?

(d) a total of two shells, with three electrons in its valence shell?

(e) twice as many electrons in its second shell as in its first shell?

Join BYJU'S Learning Program

Fill in the blanks: Periods are _______ [5, 6, 7] horizontal rows of elements in the periodic table and an element with three electron shells and two electrons in its valence shell belongs to period ____ [6, 3, 1] and group ______ [3, 6, 2].

Fill in the blanks: Periods are _ [5, 6, 7] horizontal rows of elements in the periodic table and an element with three electron shells and two electrons in its valence shell belongs to period [6, 3, 1] and group [3, 6, 2].