Question

what is mean by atom​

Answer 1

Answer:

Atoms are the basic units of matter and the defining structure of elements. ... We now know that atoms are made up of three particles: protons, neutrons and electrons — which are composed of even smaller particles, such as quarks.

Answer 2

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ᴀᴛᴏᴍs ᴀʀᴇ ᴛʜᴇ ʙᴀsɪᴄ ᴜɴɪᴛs ᴏғ ᴍᴀᴛᴛᴇʀ ᴀɴᴅ ᴛʜᴇ ᴅᴇғɪɴɪɴɢ sᴛʀᴜᴄᴛᴜʀᴇ ᴏғ ᴇʟᴇᴍᴇɴᴛs.

ᴡᴇ ɴᴏᴡ ᴋɴᴏᴡ ᴛʜᴀᴛ ᴀᴛᴏᴍs ᴀʀᴇ ᴍᴀᴅᴇ ᴜᴘ ᴏғ ᴛʜʀᴇᴇ ᴘᴀʀᴛɪᴄʟᴇs: ᴘʀᴏᴛᴏɴs, ɴᴇᴜᴛʀᴏɴs ᴀɴᴅ ᴇʟᴇᴄᴛʀᴏɴs — ᴡʜɪᴄʜ ᴀʀᴇ ᴄᴏᴍᴘᴏsᴇᴅ ᴏғ ᴇᴠᴇɴ sᴍᴀʟʟᴇʀ ᴘᴀʀᴛɪᴄʟᴇs, sᴜᴄʜ ᴀs ϙᴜᴀʀᴋs.