What is atom? what is atom?
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An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons
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ᴀɴ ᴀᴛᴏᴍ ɪs ᴀ ᴘᴀʀᴛɪᴄʟᴇ ᴏғ ᴍᴀᴛᴛᴇʀ ᴛʜᴀᴛ ᴜɴɪǫᴜᴇʟʏ ᴅᴇғɪɴᴇs ᴀᴄʜᴇᴍɪᴄᴀʟ ᴇʟᴇᴍᴇɴᴛ. ᴀɴ ᴀᴛᴏᴍ ᴄᴏɴsɪsᴛs ᴏғ ᴀ ᴄᴇɴᴛʀᴀʟ ɴᴜᴄʟᴇᴜs ᴛʜᴀᴛ ɪs ᴜsᴜᴀʟʟʏ sᴜʀʀᴏᴜɴᴅᴇᴅ ʙʏ ᴏɴᴇ ᴏʀ ᴍᴏʀᴇ ᴇʟᴇᴄᴛʀᴏɴs. ᴇᴀᴄʜ ᴇʟᴇᴄᴛʀᴏɴ ɪs ɴᴇɢᴀᴛɪᴠᴇʟʏ ᴄʜᴀʀɢᴇᴅ. ᴛʜᴇ ɴᴜᴄʟᴇᴜs ɪs ᴘᴏsɪᴛɪᴠᴇʟʏ ᴄʜᴀʀɢᴇᴅ, ᴀɴᴅ ᴄᴏɴᴛᴀɪɴs ᴏɴᴇ ᴏʀ ᴍᴏʀᴇ ʀᴇʟᴀᴛɪᴠᴇʟʏ ʜᴇᴀᴠʏ ᴘᴀʀᴛɪᴄʟᴇs ᴋɴᴏᴡɴ ᴀs ᴘʀᴏᴛᴏɴs ᴀɴᴅ ɴᴇᴜᴛʀᴏɴs.
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