Question

The smallest particle of substance.​

Answer 1

Answer:

atom

An atom is the smallest unit of a pure substance or element that can exist and still retain the properties of the original substance or element.

They're typically made up of three main parts: protons, neutrons and electrons. Think of the protons and neutrons as together forming a “sun”, or nucleus, at the centre of the system. The electrons orbit this nucleus, like planets. If atoms are impossibly small, these subatomic particles are even more so.

There are more than 109 different types of atom - one for each element. Differences between the atoms give the elements their different chemical properties. In 2001, there were 115 known elements. However, those above 109 are highly unstable and have been made in only tiny quantities.

Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together.

Answer 2

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ᴛʜᴇ ꜱᴍᴀʟʟᴇꜱᴛ ᴘᴀʀᴛɪᴄʟᴇ ᴏꜰ ꜱᴜʙꜱᴛᴀɴᴄᴇ.​

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$\Large\green\pmb{\bigstar{An~Atom\bigstar}}$

• ᴀɴ ᴀᴛᴏᴍ ɪꜱ ᴛʜᴇ ꜱᴍᴀʟʟᴇꜱᴛ ᴘᴀʀᴛɪᴄʟᴇ ᴏꜰ ᴀ ꜱᴜʙꜱᴛᴀɴᴄᴇ ᴡʜɪᴄʜ ᴄᴀɴ ᴛᴀᴋᴇ ᴘᴀʀᴛ ɪɴ ᴀ ᴄʜᴇᴍɪᴄᴀʟ ʀᴇᴀᴄᴛɪᴏɴꜱ.
• ᴛʜᴇ ꜱᴍᴀʟʟᴇꜱᴛ ᴘᴀʀᴛɪᴄʟᴇ ᴏꜰ ᴀ ꜱᴜʙꜱᴛᴀɴᴄᴇ ᴄᴀᴘᴀʙʟᴇ ᴏꜰ ɪɴᴅᴇᴘᴇɴᴅᴇɴᴛ ᴇxɪꜱᴛᴇɴᴄᴇ ᴀɴᴅ ᴡʜɪᴄʜ ʀᴇᴛᴀɪɴꜱ ᴛʜᴇ ᴄʜᴀʀᴀᴄᴛᴇʀɪꜱᴛɪᴄꜱ ᴏꜰ ᴛʜᴇ ꜱᴜʙꜱᴛᴀɴᴄᴇ ɪꜱ ᴄᴀʟʟᴇᴅ ᴀꜱ ᴀɴ ᴀᴛᴏᴍ.

• ᴀɴ ᴀᴛᴏᴍ ɪꜱ ᴛʜᴇ ꜱᴍᴀʟʟᴇꜱᴛ ᴜɴɪᴛ ᴏꜰ ᴏʀᴅɪɴᴀʀʏ ᴍᴀᴛᴛᴇʀ ᴛʜᴀᴛ ꜰᴏʀᴍꜱ ᴀ ᴄʜᴇᴍɪᴄᴀʟ ᴇʟᴇᴍᴇɴᴛ.
• ᴇᴠᴇʀʏ ꜱᴏʟɪᴅ, ʟɪQᴜɪᴅ, ɢᴀꜱ, ᴀɴᴅ ᴘʟᴀꜱᴍᴀ ɪꜱ ᴄᴏᴍᴘᴏꜱᴇᴅ ᴏꜰ ɴᴇᴜᴛʀᴀʟ ᴏʀ ɪᴏɴɪᴢᴇᴅ ᴀᴛᴏᴍꜱ.
• ᴀᴛᴏᴍꜱ ᴀʀᴇ ᴇxᴛʀᴇᴍᴇʟʏ ꜱᴍᴀʟʟ, ᴛʏᴘɪᴄᴀʟʟʏ ᴀʀᴏᴜɴᴅ 100 ᴘɪᴄᴏᴍᴇᴛᴇʀꜱ ᴀᴄʀᴏꜱꜱ.
• ᴛʜᴇʏ ᴀʀᴇ ꜱᴏ ꜱᴍᴀʟʟ ᴛʜᴀᴛ ᴀᴄᴄᴜʀᴀᴛᴇʟʏ ᴘʀᴇᴅɪᴄᴛɪɴɢ ᴛʜᴇɪʀ ʙᴇʜᴀᴠɪᴏʀ ᴜꜱɪɴɢ ᴄʟᴀꜱꜱɪᴄᴀʟ ᴘʜʏꜱɪᴄꜱ—ᴀꜱ ɪꜰ ᴛʜᴇʏ ᴡᴇʀᴇ ᴛᴇɴɴɪꜱ ʙᴀʟʟꜱ, ꜰᴏʀ ᴇxᴀᴍᴘʟᴇ—ɪꜱ ɴᴏᴛ ᴘᴏꜱꜱɪʙʟᴇ ᴅᴜᴇ ᴛᴏ Qᴜᴀɴᴛᴜᴍ ᴇꜰꜰᴇᴄᴛꜱ.
• ᴇᴠᴇʀʏ ᴀᴛᴏᴍ ɪꜱ ᴄᴏᴍᴘᴏꜱᴇᴅ ᴏꜰ ᴀ ɴᴜᴄʟᴇᴜꜱ ᴀɴᴅ ᴏɴᴇ ᴏʀ ᴍᴏʀᴇ ᴇʟᴇᴄᴛʀᴏɴꜱ ʙᴏᴜɴᴅ ᴛᴏ ᴛʜᴇ ɴᴜᴄʟᴇᴜꜱ.
• ᴛʜᴇ ᴀʙɪʟɪᴛʏ ᴏꜰ ᴀᴛᴏᴍꜱ ᴛᴏ ᴀꜱꜱᴏᴄɪᴀᴛᴇ ᴀɴᴅ ᴅɪꜱꜱᴏᴄɪᴀᴛᴇ ɪꜱ ʀᴇꜱᴘᴏɴꜱɪʙʟᴇ ꜰᴏʀ ᴍᴏꜱᴛ ᴏꜰ ᴛʜᴇ ᴘʜʏꜱɪᴄᴀʟ ᴄʜᴀɴɢᴇꜱ ᴏʙꜱᴇʀᴠᴇᴅ ɪɴ ɴᴀᴛᴜʀᴇ.

ʜᴀᴘᴘʏ ʟᴇᴀʀɴɪɴɢ ᴅᴇᴀʀ!!