18. Inert atoms (gases) a. react very easily b. do not react at all c. react und

Question

18. Inert atoms (gases) a. react very easily b. do not react at all c. react under changed temperature and pressure d, none of the above uter-most shell. number of electrons on the o 19. Inert atoms have a.-4-electrons … b. 2 electrons c. 7 electrons d. 8 electrons e. b and d are correct 20,Isotzopy is determined by the number of a. electrons b. protons c. neutrons and electrons d. protons and neutrons e. neutrons 21.The smallest particle of an element that retains its characteristic is a. element. b. atom . C. matter. d. cell 22. Which of these is NOT an example of chemical bond? a. ionic bond b. atomic bond c. covalent bond d. hydrogen bond 23.Saturated compounds have double bonds between carbon atoms. b. false

Explanation / Answer

18. b

19. d

Inert gases follows octet rule and due to this they are unreactive.

20. d

21. b

22. d

Atomic bonds are of two types- primary and secondary.

Primary bonds produce chemical bonds that holds atoms together.

metallic, covalent and ionic are primary bonds.

Secondary bonds are weaker produce weak links and create deformations in the bond.

Hydrogen and Vander wals are secondary bonds.

23. b

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