Question

Main three points of periodic table​

Answer 1

Answer:

Overview

Group 1 2

Alkali metals Alkaline earth metals

Period 1                          Hydrogen1H​1.008  

2 Lithium3Li​6.94  Beryllium4Be​9.0122

3 Sodium11Na​22.99   Magnesium12Mg​24.305

Answer 2

Explanation:

in Modern Periodic Table in Modern Periodic Table 1818 group and 17 seven period Henry moseley suggested that the atoms where arrange in the atomic number not in atomic masses then Neil Bose design Modern Periodic Table in the modern periodic table 118 element known that time and the total capacity of periodic table each 120 element in Modern Periodic Table there has four orbitals s p d f blocks first period is known as the alkali metal in the second period elements is known as alkaline earth metal because it found in earth and the 17th group is known as halogens and it in the novel are inert gases .

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