Question

Write the atomic masses of elements having atomic number 1 to 20

Answer 1

$\huge\mathcal{Answer \ :-}$

$\tt\red{Atomic \ mass \ :-}$

$\tt\red{It \ is \ the \ sum \ of \ Protons \ and}$
$\tt\red{Neutrons.}$

$\mathsf{1. \ Hydrogen \ (H) \ = \ 1 \ u}$

$\mathsf{2. \ Helium \ (He) \ = \ 4 \ u}$

$\mathsf{3. \ Lithium \ (Li) \ = \ 7 \ u}$

$\mathsf{4. \ Beryllium \ (Be) \ = \ 9 \ u}$

$\mathsf{5. \ Boron \ (B) \ = \ 10 \ u}$

$\mathsf{6. \ Carbon \ (C) \ = \ 12 \ u}$

$\mathsf{7. \ Nitrogen \ (N) \ = \ 14 \ u}$

$\mathsf{8. \ Oxygen \ (O) \ = 16 \ u}$

$\mathsf{9. \ Fluorine \ (F) \ = \ 19 \ u}$

$\mathsf{10. \ Neon \ (Ne) \ = \ 20 \ u}$

$\mathsf{11. \ Sodium \ (Na) \ = \ 23 \ u}$

$\mathsf{12. \ Magnesium \ (Mg) \ = 24 \ u}$

$\mathsf{13. \ Aluminium \ (Al) \ = \ 27 \ u}$

$\mathsf{14. Silicon \ (Si) \ = \ 28 \ u}$

$\mathsf{15. Phosphorus \ (P) \ = \ 31 \ u}$

$\mathsf{16. Sulphur \ (S) \ = \ 32 \ u}$

$\mathsf{17. \ Chlorine \ (Cl) \ = \ 35.5 \ u}$

$\mathsf{18. \ Argon \ (Ar) \ = \ 40 \ u}$

$\mathsf{19. \ Potassium \ (K) \ = \ 39 \ u}$

$\mathsf{20. \ Calcium \ (Ca) \ = \ 40 \ u}$

$\huge\mathbb{Hope \ this \ helps.}$

Answer 2

Answer:

Atomic to 30 Let us Number of Elements from 1 take a look at what is the atomic mass of elements from 1 to 30.

see the attachment for answers.

there are three photos

atomic mass 1to30