![In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number. - Science and Technology 1 | Shaalaa.com In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number. - Science and Technology 1 | Shaalaa.com](https://www.shaalaa.com/images/_4:c358c469d03c41f181dbe265c90abeed.png)
In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number. - Science and Technology 1 | Shaalaa.com
![periodic table of elements upto 20 serially - Yahoo Image Search Results | Chemistry basics, Element chemistry, Periodic table periodic table of elements upto 20 serially - Yahoo Image Search Results | Chemistry basics, Element chemistry, Periodic table](https://i.pinimg.com/originals/3a/9a/16/3a9a168e49c01834ba751e632bcd984e.png)
periodic table of elements upto 20 serially - Yahoo Image Search Results | Chemistry basics, Element chemistry, Periodic table
![Best Answer] 1 to 20 elements of periodic table with its atomic number mass and valency - Brainly.in Best Answer] 1 to 20 elements of periodic table with its atomic number mass and valency - Brainly.in](https://hi-static.z-dn.net/files/dad/569af3596f1d5da6f3cb20a5091089aa.jpg)
Best Answer] 1 to 20 elements of periodic table with its atomic number mass and valency - Brainly.in
![Higher Chemistry Unit 1-key area 1: Structure and bonding in the first 20 elements Diagram | Quizlet Higher Chemistry Unit 1-key area 1: Structure and bonding in the first 20 elements Diagram | Quizlet](https://o.quizlet.com/UahxsN3h018WThTV.93Z-w_b.jpg)