Question

Define atomic mass unit. What is its symbol

Answer 1

ᴀɴ ᴀᴛᴏᴍɪᴄ ᴜɴɪᴛ ᴏғ ᴍᴀss ɪs ᴅᴇғɪɴᴇᴅ ᴀs ᴀᴄᴄᴜʀᴀᴛᴇʟʏ 1/12 ᴛʜᴇ ᴍᴀss ᴏғ ᴀ ᴄᴀʀʙᴏɴ-12 ᴀᴛᴏᴍ. ᴛʜᴇ ᴄᴀʀʙᴏɴ-12 ᴀᴛᴏᴍ ʜᴀs sɪx ɴᴇᴜᴛʀᴏɴs ᴀɴᴅ sɪx ᴘʀᴏᴛᴏɴs ɪɴ ɪᴛs ɴᴜᴄʟᴇᴜs. ᴛʜᴇ ᴀᴛᴏᴍɪᴄ ᴜɴɪᴛ ᴍᴀss ɪs sʏᴍʙᴏʟɪᴢᴇᴅ ᴀs ᴀᴍᴜ ᴏʀ ᴀᴍᴜ. 1 ᴀᴍᴜ = ᴀᴠᴇʀᴀɢᴇ ᴏғ ᴛʜᴇ ᴘʀᴏᴛᴏɴ ʀᴇsᴛ ᴍᴀss ᴀɴᴅ ᴛʜᴇ ɴᴇᴜᴛʀᴏɴ ʀᴇsᴛ ᴍᴀss.

Answer 2

Explanation:

An atomic unit of mass is defined as accurately 1/12 the mass of a carbon-12 atom. The carbon-12 atom has six neutrons and six protons in its nucleus. The atomic unit mass is symbolized as AMU or amu. 1 AMU = Average of the proton rest mass and the neutron rest mass.

The atomic mass of an element is the relative mass of its atom as compared with the mass of a carbon-12 atom taken as 12 units.