True/False Q
1.electron shells are negatively charged.
2.the second electron shell of an atom can hold a maximum of 8 electrons.
MCQ
1.X is an element in the periodic table and X+ ion has an electionic arrangement of 2,8,8.Which of thw follwing ststements concerning X is correct?
A . X is a halogen.
B. X is a transition element.
C X is a Group 0 element.
D X is a Period 4 element.
thanks!!
f.4 chem atomic structure
2012-10-22 4:20 am
回答 (3)
2012-10-22 7:52 am
✔ 最佳答案
1. true因為electron係-ve,electron shells 只有-ve的electron而沒有其他+ve的particles存在,so electron shell係-ve
2.true
maximum no.of electons that nth shell can hold can be found by 2n^2
3.D
因為x+ ions即係x少左一粒電子,
所以x的atomic no.係2+8+8+1=19
即係potassium,係period 4
2012-10-23 3:32 am
1.T
2.T
maximum no.of electons that nth shell can hold can be found by the
formular 2(n^2)
3.D
X+ ion has an electionic arrangement of 2,8,8, so X element has an electionic
arrangement of 2,8,8,1 , which is potassium group 1 element, not halogen(gp7)
2.T
maximum no.of electons that nth shell can hold can be found by the
formular 2(n^2)
3.D
X+ ion has an electionic arrangement of 2,8,8, so X element has an electionic
arrangement of 2,8,8,1 , which is potassium group 1 element, not halogen(gp7)
參考: my knowledge
收錄日期: 2021-04-13 19:04:03
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