1) How many blocks are there in the modern periodic table? a) 2 b) 4 2) Transition elements are located in which block? a) p b) d 3) There 18 horizontal period in the modern periodic table a) yes b) No 4) Element Ca 20 is located in period number 4 a) yes b) No 5) lanthanides and Actinides located in ....plock a) f b) s 6) There are ....... groups in S-block a) 6 b) 2 7) Number of electrons in the outer most energy level indicates... a) group number b) Period number

Science

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？