Zita asked in 科學及數學化學 · 1 decade ago

F.4 CHM [easy . only 睇唔明題目]

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!!

3 Answers

Rating
  • 1 decade ago
    Favorite Answer

    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.

  • 1 decade ago

    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 decade ago

    佢係問下列邊對係非金屬(dMC既number,代表原子序)

    Source(s): 自己
Still have questions? Get your answers by asking now.