4A heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood; Metal shackles; for hands or legs (4)
6A hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition (6)
8A colourless and odourless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere (5)
10A solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239 (9)
11A bluish-white lustrous metallic element; brittle at ordinary temperatures but malleable when heated; used in a wide variety of alloys and in galvanizing iron; it occurs as zinc sulphide in zinc blende (4)
12A soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia (4)
15A highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium (8)
17A soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey. Mixture of graphite with clay in different degrees of hardness; the marking substance in a pencil (4)
18A radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms (9)

19A hard brittle blue-grey or blue- black metallic element that is one of the platinum metals; the heaviest metal known (6)
20A soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores (7)
21A heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium (7)
22A rare soft silvery metallic element; occurs in small quantities in sphalerite (6)


1A hard malleable ductile silvery metallic element that is resistant to corrosion; used in alloys; occurs in pentlandite and smaltite and garnierite and millerite. A United States coin worth one twentieth of a dollar (6)
2A soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion- exchange process (12)
3A light strong grey lustrous corrosion-resistant metallic

element used in strong light- weight alloys (as for aeroplane parts); the main sources are rutile and ilmenite (8)
5A colourless odourless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts (4)
7A light strong brittle grey toxic bivalent metallic element (9)
9A white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth (9)
10A light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite (9)
13A heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits (8)
14A silvery ductile metallic element found primarily in bauxite (8)
16A bivalent and trivalent metallic element of the rare earth group (8)

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