Question

Name of first elements from the atomic number 1-20 with their atomic number and mass number

Answer 1

Hi.

Here is your answer--

The name of the First 20 elements of the long form of the Periodic table are given below with their atomic numbers and atomic mass-----

@---- Hydrogen {H}
           Z = 1
           A = 1

@----Helium{He}
         Z = 2
         A = 4

@---- Lithium{Li}
         Z = 3
         A = 7

@----Beryllium{Be}
        Z = 4
        A = 9

@----Boron{B}
       Z = 5
      A = 10

@----Carbon{C}
       Z = 6
       A = 12

@----Nitrogen{N}
      Z = 7
      A = 14

@---- Oxygen{O}
     Z = 8
   A = 16

@---- Flourine{F}
       Z = 9
      A = 19

@---- Neon{Ne}
         Z = 10
         A = 20

@---- Sodium{Na}
        Z = 11
        A = 23

@----Magnesium{Mg}
        Z = 12
       A = 24

@----Aluminum{Al}
       Z = 13
       A = 27

@---- Silicon{Si}
      Z = 14
      A = 28

@----Phosphorus{P}
      Z = 15
      A = 31

@---- Sulphur{S}
      Z = 16
      A = 32

@---- Chlorine{Cl}
      Z = 17
      A = 35

@---- Argon{Ar}
      Z = 18
      A = 40

@----Potassium{K}
      Z = 19
      A = 39

@---- Calcium{Ca}
      Z = 20
      A = 40

Note -----
Atomic Number is represented by the letter Z
Mass Number is represented by the letter A


Hope it helps.

Have a nice day.