REVIEW QUESTIONS 4. If xenon has an atomic number of 54 and a mass number of 108

Question

REVIEW QUESTIONS 4. If xenon has an atomic number of 54 and a mass number of 108, how many neutrons does it have? shells 1 and 2 are full, and shell 3 has nine electrons shells 1, 2 and 3 are full and shell 4 has three electrons a. a. 54 b. 27 . 100 d. 108 b. c. shells 1, 2 and 3 are full and shell 4 has on d. electron shells 1, 2 and 3 are full and no other electrons are present 5. Atoms that vary in the number of neutrons found in their nuclei are called 7. Which type of bond represents a weak chemica bond? a. ions b. neutrons c, neutral atoms d. isotopes a. hydrogen bond b. atomic bond c. covalent bond d. nonpolar covalent bond 6. Potassium has an atomic number of 19. What is its electron configuration? 8. Which of the following statements is not true?

Explanation / Answer

4. According to the rule no of neutrons=mass no. - atomic no.

So here our answer is 108-54=54 i.e. no of neutrons is 54. ( option A)

5. Atoms with varying no of neutrons in their nucleus are called 'isotopes' i.e. they have same no of electrones and protons but different no of neutrons example C-12 and C-13 (option D)

6. Potassium has electronic configuration 2,8,8,1 so the correct answer is option C.

7. Hydrogen bonds are very weak chemical bonds created by one hydrogen atom and other electri negative atom like oxygen, Nitrogen etc...so answer is option A.

8. Ans is D because most abundant atom in atmosphere is Nitrogen

9. Answer is ph decreases option A.

10.ans C

11. B

12. D

13. A

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