Question

The atomic radius decreases in moving
from left to right along a period.give reason​

Answer 1

Answer:

Atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius. ... This is caused by electron shielding.

Answer 2

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ᴀᴛᴏᴍɪᴄ ʀᴀᴅɪᴜs ᴅᴇᴄʀᴇᴀsᴇs ғʀᴏᴍ ʟᴇғᴛ ᴛᴏ ʀɪɢʜᴛ ᴡɪᴛʜɪɴ ᴀ ᴘᴇʀɪᴏᴅ. ᴛʜɪs ɪs ᴄᴀᴜsᴇᴅ ʙʏ ᴛʜᴇ ɪɴᴄʀᴇᴀsᴇ ɪɴ ᴛʜᴇ ɴᴜᴍʙᴇʀ ᴏғ ᴘʀᴏᴛᴏɴs ᴀɴᴅ ᴇʟᴇᴄᴛʀᴏɴs ᴀᴄʀᴏss ᴀ ᴘᴇʀɪᴏᴅ. ᴏɴᴇ ᴘʀᴏᴛᴏɴ ʜᴀs ᴀ ɢʀᴇᴀᴛᴇʀ ᴇғғᴇᴄᴛ ᴛʜᴀɴ ᴏɴᴇ ᴇʟᴇᴄᴛʀᴏɴ; ᴛʜᴜs, ᴇʟᴇᴄᴛʀᴏɴs ᴀʀᴇ ᴘᴜʟʟᴇᴅ ᴛᴏᴡᴀʀᴅs ᴛʜᴇ ɴᴜᴄʟᴇᴜs, ʀᴇsᴜʟᴛɪɴɢ ɪɴ ᴀ sᴍᴀʟʟᴇʀ ʀᴀᴅɪᴜs. ᴛʜɪs ɪs ᴄᴀᴜsᴇᴅ ʙʏ ᴇʟᴇᴄᴛʀᴏɴ sʜɪᴇʟᴅɪɴɢ.