Question

What are the elements showing lanthenide and actinide contraction?

Answer 1

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ᴛʜᴇ ʟᴀɴᴛʜᴀɴɪᴅᴇ ᴀɴᴅ ᴀᴄᴛɪɴɪᴅᴇ sᴇʀɪᴇs ᴍᴀᴋᴇ ᴜᴘ ᴛʜᴇ ɪɴɴᴇʀ ᴛʀᴀɴsɪᴛɪᴏɴ ᴍᴇᴛᴀʟs. ᴛʜᴇ ʟᴀɴᴛʜᴀɴɪᴅᴇ sᴇʀɪᴇs ɪɴᴄʟᴜᴅᴇs ᴇʟᴇᴍᴇɴᴛs 58 ᴛᴏ 71, ᴡʜɪᴄʜ ғɪʟʟ ᴛʜᴇɪʀ 4ғ sᴜʙʟᴇᴠᴇʟ ᴘʀᴏɢʀᴇssɪᴠᴇʟʏ.

ᴛʜᴇ ᴀᴄᴛɪɴɪᴅᴇs ᴀʀᴇ ᴇʟᴇᴍᴇɴᴛs 89 ᴛᴏ 103 ᴀɴᴅ ғɪʟʟ ᴛʜᴇɪʀ 5ғ sᴜʙʟᴇᴠᴇʟ ᴘʀᴏɢʀᴇssɪᴠᴇʟʏ.

Answer 2

Explanation:

The lanthanide and actinide series make up the inner transition metals. The lanthanide series includes elements 58 to 71, which fill their 4f sublevel progressively. The actinides are elements 89 to 103 and fill their 5f sublevel progressively.