Question

at the beginning of which century the word population was one billion ​

Answer 1

ᴛʜᴇ ᴀᴛᴏᴍɪᴄ ʀᴀᴅɪᴜs ᴏғ ᴀ ᴄʜᴇᴍɪᴄᴀʟ ᴇʟᴇᴍᴇɴᴛ ɪs ᴀ ᴍᴇᴀsᴜʀᴇ ᴏғ ᴛʜᴇ sɪᴢᴇ ᴏғ ɪᴛs ᴀᴛᴏᴍs, ᴜsᴜᴀʟʟʏ ᴛʜᴇ ᴍᴇᴀɴ ᴏʀ ᴛʏᴘɪᴄᴀʟ ᴅɪsᴛᴀɴᴄᴇ ғʀᴏᴍ ᴛʜᴇ ᴄᴇɴᴛᴇʀ ᴏғ ᴛʜᴇ ɴᴜᴄʟᴇᴜs ᴛᴏ ᴛʜᴇ ʙᴏᴜɴᴅᴀʀʏ ᴏғ ᴛʜᴇ sᴜʀʀᴏᴜɴᴅɪɴɢ sʜᴇʟʟs ᴏғ ᴇʟᴇᴄᴛʀᴏɴs.❤

Answer 2

Answer:

World population milestones went unnoticed until the 20th century, since there was no reliable data on global population dynamics. It is estimated that the population of the world reached one billion for the first time in 1804.