20. QUIZ Element D has a proton number of 19. where is element D located in the Periodic Table? A. Group 1 B. Group 13 C. Group 14 D. Group 17
21. QUIZ An atom of element E has 10 neutrons. The nucleon number of element E is 19. In which group and period is element E located in the periodic table? A. Group 13, Period 1 B. Group 17, Period 2 C. Group 15, Period 2 D. Group 17, Period 1
22. QUIZ An electron arrangement of x is 2.8.8 then, what is element x? B. Sulphur A. Silicon C. Argon D. Magnesium
23. QUIZ An atom of element x is located in Group 18 and Period 2. What is the electron arrangement and proton number of atom x? ANSWER