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Atomic number and mass number of 1 to 20 elements with symbol Atomic number is the number of proton elements in a nucleus Mass number = no of protons + no of neutrons Atomic number and mass number of first 20 elements are listed below: Atomic Number Symbol Element Name Mass Number 1 H Hydrogen 1 2 He Helium 4 3 Li Lithium 7 4 B e Beryllium 9 5 B Boron 11 6 C Carbon 12 7 N Nitrogen 14 8 O Oxygen 16 9 F
1 to 20 elements of periodic table with its atomic number mass and valency Potassium - Atomic number: 19, valency: +1 Calcium - Atomic number: 20, valency: +2 Learn more about atomic number and valency Valency, atomic number and symbol of first 30 elements in periodic table brainly in question 1164903 Define atomic number , mass number and valency brainly in question 6880409 Explore all similar answers arrow right
Which element has the highestaverage atomic mass?A. IodineB . . . - Brainly Explanation: Tellurium: Has an average atomic mass of 127 6 Iodine: Has an average atomic mass of 126 9 Bromine: Has a significantly lower average atomic mass compared to the other options Krypton: Also has a lower average atomic mass than Tellurium Key point: When comparing the atomic masses of these elements, Tellurium has the highest value