Question

4. From the standpoint of atomic structure, what determines
which element will be the first and which the last in a period
of the periodic table ?

5. (a) What are the following groups known as ?
(i) Group 1 (ii) Group 17 (iii) Group 18
(b) Name two elements of each group.

6. What is the number of elements in the :
(a) Ist period, and
(b) 3rd period, of the modern periodic table ?

7. How does number of (i) valence electrons (ii) valency;
vary on moving from left to right:
(a) in the second period of a periodic table ?
(b) in the third period of a periodic table ?
8. How do atomic structures (electron arrangements) change
in a period with increase in atomic numbers moving left to
right?

answer these questions and give answer in attachment.the answer should be written in copy not screenshot , I want the answers written in copy​

Answer 1

Question no. 4

✍Answer ✍

From the standpoint of atomic structure, atomic number determines which element will be the first and which the last in a period of the periodic table.

Question no. 5

✍Answer ✍

In chemistry, a group (also known as a family[]) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the f-block columns (between groups 2 and 3) are not numbered. The elements in a group have similar physical or chemical characteristics of the outermost electron shells of their atoms (i.e., the same core charge), because most chemical properties are dominated by the orbital location of the outermost electron.

✍hope it's helpful to you ✍

$\huge\bold\red{-Mr Dangerous}$