Question

The atomic number of an element is 34. Then it is present in _____ period and ______ group.
[A] 4th period and IV A group
[B] 4th period and VI A group
[C] 4th period and VII A group
[D] 5th period and VI A group

Answer 1

Hint: To solve this, firstly write down the electronic configuration of the given element using its atomic number. Then see the shell in which the last electron is entering and this will give you the period it belongs to. See the number of electrons in its outermost shell and this will give you the group it belongs to.

Complete step by step answer:
We know that the periodic table is a tabular display of chemical elements found in nature. There are 118 elements in the periodic table. They are arranged according to their atomic number, electronic configuration and repetitive chemical properties.

Now, let us discuss the periodic table briefly to answer this question.
Periodic table has seven horizontal rows and 18 vertical columns. The horizontal rows have metals towards the left and nonmetals on the right. The vertical columns have elements having similar chemical behaviours. The horizontal rows are called period and the vertical columns are called groups.
Now, to find the position of the given element we have to write down its electronic configuration.
The atomic number of the element is given as 34 so we can use this to write down the electronic configuration which will be: $1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}4{{s}^{2}}4{{p}^{4}}$ .

Now, we can see that the valence electron is entering in the fourth shell so from here we can say that it belongs to the 4th period. Also, in its outermost orbital, there are 6 electrons so we can say that it belongs to the 6th group. So its position in the periodic table is 4th period and VI A group.
So, the correct answer is “Option B”.

Note: The first ever periodic table was created by a Russian chemist named Dmitri Mendeleev. Mendeleev’s periodic table has 63 elements. They were placed in a tabular form in increasing order of their relative atomic masses. There were certain limitations to Mendeleev’s periodic table which lead to the modern periodic table.