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CBSE Class 9 Answered

The description of atomic particles of two elements X and Y is given below:   X Y Protons 8 8 neutrons 8 9 electrons 8 8         (i) What is the atomic number of Y? (ii) What is the mass number of X? (iii) What is the relation between X and Y? (iv) Which element/elements do they represent? (v) Write the electronic configuration of X? (vi) Write the cation/anion formed by the element.
Asked by Topperlearning User | 04 Apr, 2016, 11:01: AM
answered-by-expert Expert Answer

(i) Atomic number of Y = no. of electrons/protons = 8

(ii) Mass number of X = no. of protons + no. of neutrons = 8 + 8 =16

(iii) X and Y are isotopes since they have same atomic number.

(iv) X and Y represent Oxygen since oxygen has Atomic number = 8.

(v) begin mathsize 12px style straight O presubscript 8 presuperscript 16 end style. Electronic configuration: 2, 6.

(vi) It will form an anion: O-2

Answered by | 04 Apr, 2016, 01:01: PM
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