Trick to learn atomic mass of first 30 elements||atomic mass number

Trick to learn atomic mass of first 30 elements||atomic mass number
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[VScienceAcademy]

Boron atomic number is 5, which is an odd number, I mistakenly called 5 as an even number.🙏🙏

[JOYNOEL]

Thanks you so much mam for a beautiful lecture 💕 it means a lot mam