Question

which points are considered for the arrangement of modern periodic table
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Answer 1

Answer:

The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods

Answer 2

ᴛʜᴇ ᴘᴇʀɪᴏᴅɪᴄ ᴛᴀʙʟᴇ ᴏғ ᴇʟᴇᴍᴇɴᴛs ᴀʀʀᴀɴɢᴇs ᴀʟʟ ᴏғ ᴛʜᴇ ᴋɴᴏᴡɴ ᴄʜᴇᴍɪᴄᴀʟ ᴇʟᴇᴍᴇɴᴛs ɪɴ ᴀɴ ɪɴғᴏʀᴍᴀᴛɪᴠᴇ ᴀʀʀᴀʏ. ᴇʟᴇᴍᴇɴᴛs ᴀʀᴇ ᴀʀʀᴀɴɢᴇᴅ ғʀᴏᴍ ʟᴇғᴛ ᴛᴏ ʀɪɢʜᴛ ᴀɴᴅ ᴛᴏᴘ ᴛᴏ ʙᴏᴛᴛᴏᴍ ɪɴ ᴏʀᴅᴇʀ ᴏғ ɪɴᴄʀᴇᴀsɪɴɢ ᴀᴛᴏᴍɪᴄ ɴᴜᴍʙᴇʀ. ᴏʀᴅᴇʀ ɢᴇɴᴇʀᴀʟʟʏ ᴄᴏɪɴᴄɪᴅᴇs ᴡɪᴛʜ ɪɴᴄʀᴇᴀsɪɴɢ ᴀᴛᴏᴍɪᴄ ᴍᴀss. ᴛʜᴇ ʀᴏᴡs ᴀʀᴇ ᴄᴀʟʟᴇᴅ ᴘᴇʀɪᴏᴅs.