which of the following pairs of atomic numbers correspond(s) to a pair of non-metals?
1) 1, 7
2) 9,18
3) 4, 14
A: 2 ONLY
B: 3 ONLY
C: 1 and 2 ONLY
D: 1 and 3 ONLY
ans is c! why???
條問題想問乜???
plz ans quickly. 星期一test!!
F.4 CHM [easy . only 睇唔明題目]
2006-10-21 11:05 pm
回答 (3)
2006-10-21 11:44 pm
✔ 最佳答案
1)correct.1:H is NOT a metal
7:N is NOT a metal
2)correct.
9: F is NOT a metal, it has electronic arrangement of 2,7, meaning it has 7 outermost shell electron, it belongs to the halogens.
18:Ar is NOT a metal, its electronic arrangement is 2,8,8, since it has a fullfilled outermost shell, it is a nobel gas.
3)wrong.
4:Be is an alkaline earth metal. It has electronic arrangement of 2,2, meaning that it has 2 outermost shell electrons.
14:Si is a metalliod.
2006-10-21 11:46 pm
佢問你邊對atomic number係non-metal既atomic number
1,7
9,18
係Hydrogen, Nitrogen, fluorine, Argon既atomic number
佢地都係non-metal
而4,14
就係Beryllium, Silicon既atomic number
唔係non-matel
所以答案係C
1,7
9,18
係Hydrogen, Nitrogen, fluorine, Argon既atomic number
佢地都係non-metal
而4,14
就係Beryllium, Silicon既atomic number
唔係non-matel
所以答案係C
收錄日期: 2021-04-25 15:34:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061021000051KK02869