Question

7. How many valence electrons does Br atom have? (1)2 (2) 4 (3) 7 (4) 8 18. How many electrons must a Sc atom lose to form a stable cation? (1) 5 (2)3 (3)7 (4) 8 19. Which element has the following ground-state electron configuration (Kry5s4d105p? (3) 1 (4) Te (1) Sn (2) Sb 20. Which one of the following elements forms a stable 2- anion? (1) P (2) Se (3) AI (4) Mg 21. Which two of the following make an isoelectronic pair. C, 0-, F, Cal Fem? (1) Cat and CH (2) O2- and F (3) F and CH (4) Fest and Ca2+ 22. Which of the following is the electron configuration for the aluminum ion? (1) 15°2s 2p 3s2 (2) 1525220 (3) 1s22s22p3s23p? (4) 1s22s22p63s 3p 23. Which of the atoms listed below has the smallest radius? (1) CI (2) K (3) P (4) Sb 24. Which of the following elements has the largest first ionization energy? (1) F (2) Na (3) Br (4) K (1) 1 (2) 3 (3) 5 25. How many orbitals are allowed in a subshell if l = 2? (4)7 (1)4 (2)3 (3)2 (4) 1 26. What must be the charge on a Fe ion that is isoelectronic with Cor? 27. Which statement is true? (1) All 3d orbitals have the same shape, just different orientations. (2) The 4s (4) None orbital can be represented by a sphere. (3) A 3p orbital has the same energy as a 2p orbital. of these statements above are true. the spectrum of hydrogen obtained from a gas discharge tube?! normi to one with a lower enes

Answer 1

3 7 7 Bromine contains valence electrons 18. So atom lose to form steth cartoon: 2) 3 19. [kr] ss sapu dosps - 3) I 20. Steble 2-asione 21. iso elefront peur : 11 cat and of 22. Alunnu ion : 415225 22p6 48² 3pl 23 smellst radin: 1) de 24. largest first rogethens enese DE 25.1=2=) 3) I sutshely 26. pe ion that is iso elefree co3t: 3) 2 erbital can be t. The torne Staturet : 2) The us represented by a sphere.