![]() Which substance at STP exists in the form of a monatomic gas? (1) neon (3) chlorine (2) oxygen (4) nitrogenġ9. Which element is a liquid at STP and has low electrical conductivity? (1) silver (3) barium (2) mercury (4) bromineĩ. Which of the following gases is monatomic at STP? (1) hydrogen (3) oxygen (2) chlorine (4) heliumġ8. Nonmetallic elements in the solid phase tend to be (1) malleable (3) brittle (2) ductile (4) conductorsĨ. Which substance can not be decomposed by a chemical change? (1) Ne (3) HF (2) N2O (4) H2Oġ7. Which element is most likely a nonmetal? (1) A (3) C (2) B (4) Dħ. Which group in the Periodic Table contains elements that are all monatomic gases at STP? (1) 15 (3) 17 (2) 16 (4) 18 Which element is a noble gas? (1) antimony (3) gold (2) krypton (4) francium 6. Which element is a noble gas? (1) W (3) N (2) Ar (4) Er 5. The table below shows some properties of elements A, B, C, and D.Ĥ. Which element is classified as a noble gas at STP? (1) hydrogen (3) neon (2) oxygen (4) nitrogen 16. Which element exists as monatomic molecules at STP? (1) hydrogen (3) argon (2) nitrogen (4) chlorine 15. Which element is a noble gas? (1) krypton (3) antimony (2) chlorine (4) manganese 14. Which element exists as a monatomic gas molecule at STP? (1) nitrogen (3) bromine (2) barium (4) neonġ3. The elements of which group consist of monatomic gas molecules at STP? (1) 1 (3) 17 (2) 2 (4) 18 3. (4) They are brittle and lack metallic luster. (3) They are brittle and have metallic luster. (2) They are malleable and lack metallic luster. ![]() Which characteristics describe most nonmetals in the solid phase? (1) They are malleable and have metallic luster.
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