Question

Define atomic number and mass number​

Answer 1

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i) Atomic number is the total number of protons present in the nucleus of an atom. It is also equal to the number of electrons for a neutral atom. Example, atomic number of sodium is 11.

ii) Mass number is the number of protons and neutrons in the nucleus taken together. For example, mass number of sodium is 23 g/mol.

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Answer 2

Hᴇʀᴇ's Yᴏᴜʀ Aɴsᴡᴇʀ:-

Aᴛᴏᴍɪᴄ Nᴜᴍʙᴇʀ:-

• Tʜᴇ Nᴜᴍʙᴇʀ ᴏғ Pʀᴏᴛᴏɴs ɪɴ Tʜᴇ Nᴜᴄʟᴇᴜs ᴏғ ᴀɴ Aᴛᴏᴍ, Wʜɪᴄʜ ɪs Cʜᴀʀᴇᴄᴛᴇʀɪsᴛɪᴄ ᴏғ ᴀ Cʜᴇᴍɪᴄᴀʟ Eʟᴇᴍᴇɴᴛ Aɴᴅ Dᴇᴛᴇʀᴍɪɴᴇs Iᴛs Pʟᴀᴄᴇ ɪɴ Tʜᴇ Pᴇʀɪᴏᴅɪᴄ Tᴀʙʟᴇ.

Mᴀss Nᴜᴍʙᴇʀ:-

• Mᴀss Nᴜᴍʙᴇʀ ɪs Tʜᴇ Nᴜᴍʙᴇʀ ᴏғ Pʀᴏᴛᴏɴs Aɴᴅ Nᴇᴜᴛʀᴏɴs ɪɴ Tʜᴇ Nᴜᴄʟᴇᴜs Tᴀᴋᴇɴ Tᴏɢᴇᴛʜᴇʀ.

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