question_answer

Five atoms are labeled as follows:

Atoms	A	D	C	L	S
A	40	19	7	16	20
Z	20	9	3	8	10

(i) Find the ratio of their no. of neutrons (ii) Identify the atoms in which \[\frac{A}{Z}>2\]   (iii) Identify the atoms in which \[\frac{A}{2Z}=1\]

Answer:

Let first find the neutrons Same + this new row

Atoms	A	D	C	L	S
A	40	19	7	16	20
Z	20	9	3	8	10
A - Z	20	10	4	8	10

(i) Ratio of no. of neutrons: A : D : C : L : S \[=10:5:2:4:5\] (ii) \[\frac{A}{Z}>2\]\[\Rightarrow \]\[A>2Z\] From the table, it is clear that for the atoms D and \[C\text{ },\text{ }A\text{ }>\text{ }2Z\] (iii) From the table, it is clear that for the atoms A, L and S, \[A=2Z\].