Question

why this arrangement of elements is similar to the above period of modern periodic table


10th class paper​

Answer 1

Answer:

Step-by-step explanation:

As we move from left to right in a periodic table the atomic radius decreases, it can be explained on the fact that as we move from left to right the atomic number increase, this leads to the increase in number of protons and electrons, but there is no addition of a new shell with increase in atomic number, therefore the force of attraction between the electrons and protons increases which leads to shrinking of atomic radius  , so the atomic radius follows the given trend.

Answer 2

Step-by-step explanation:

(i) According to the decreasing order of atomic radii:

Li > Be > B > C > N > O.

(ii) The given elements belong to Period 2.

(iii) You will find that the atomic radius goes on decreasing while going from left to right, within

a period. The reason behind this is as follows. While going from left to right, within a period, the

atomic number increases one by one, meaning the positive charge on the nucleus increases

by one unit at a time. However, the additional electron gets added to the same outermost shell.

Due to the increased nuclear charge the electrons are pulled towards the nucleus to a greater

extent and thereby the size of the atom decreases.

(iv) In these elements, Lithium has the biggest atom and Oxygen has the smallest atom.

(v) You will find that the atomic radius goes on decreasing while going from left to right within a

period.

(These are all the answers of that question)