Question

Elements up to 30 atomic number,valency, atomic structure and symbols

Answer 1

For remembering name of elements from atomic number 21 to 30, Mnemonics is as follows :

Now, Trick to remember atomic mass of 21 to 30 elements :

Trick : Double of Atomic number + Magic no.

Answer 2

Element Atomic Number Valency

1.Hydrogen 1 1 H

2. Helium 2 0 He

3. Lithium 3 1 Li

4. Beryllium 4 2 Be

5. Boron 5 3 B

6. Carbon 6 4 C

7. Nitrogen 7 3 N

8. Oxygen 8 2 O

9. Fluorine 9 1 F

10. Neon 10 0 Ne

I hope this answer will help you dear........