半はん金きん属ぞく

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Meanings

1

noun

metalloid; semimetal

chemistry

Chemistry term for elements with properties intermediate between metals and nonmetals, such as silicon or arsenic.

half, middle, odd number

金gold

属belong, genus, subordinate official

金きん属ぞく
金属 means 'metal', while 半金属 specifically refers to elements with properties between metals and nonmetals.
非ひ金きん属ぞく
非金属 means 'nonmetal', the opposite of 金属. 半金属 is intermediate between the two.

Compound of 半 (half, semi-) and 金属 (metal), directly corresponding to the English 'semimetal' or 'metalloid'.