Question

X is an element of the modern periodic table. It is surrounded by elements having the atomic numbers 17,34,36 and 53.
(i) What is the atomic number of X?
(ii) Predict its position in the periodic table.
(iii) Which among these do not belong to the same period?

Answer 1

Hint: In order to answer the following question, we need to will acquainted with the features of modern periodic table and the following formula the maximum number of electrons present in shell = $2{n^2}$
Where n = shell number

Complete step by step answer:
X is an element of the modern periodic table and is surrounded by elements having the atomic number 17,34,36 and 53
Before answering the question let us try to understand about the modern periodic table in the modern periodic table, in elements are arranged is the increasing order of atomic number the main features of the modern periodic table are there are a total of 118 elements in the periodic table which are present in seven horizontal called periods and eighteen vertical columns called groups
Atomic numbers increase by a unit factor along the period while descending the group, the atomic number increases following a certain pattern. The maximum number of electrons present in a particular shell is calculated by the formula $2{n^2}$where n represents shell number K shell which is the first shell can hold up to \[2{(1)^2} = 2\]electron similarly L shell (n=2) can hold up to 8 electron as we descend down the group the number of shell increase
Using the following data, we can calculate the atomic number of 'X'
Since X is surrounded by elements having atomic number 17,34,36 and 53.
Element with atomic number 17 is chlorine and atomic number 53 is iodine since there elements surround X. thus X belongs to the same group which is group 17. We add 8 chlorine atomic numbers to get 35 analysing their elements with atomic numbers 34 and 36. We found that they belong to the same period 35. hence the required atomic number is
So, use can how answer the question
The atomic number of X is 35
X belong to group 17 and period = 4 of the periodic table
The elements with atomic number 17 and 53 do not belong to the same period

Note:
Students should note that the study of modern periodic table (groups and periods) and its salient features is very significant while answering the following question. As it is said that the study of the modern periodic table is so significant it is called the pillar of chemistry.