Question

eliment no. atomic no. mass no.
A 8 14
B 7 14
C 8 16
D 9 19
Answer the questions based on the table given above.
1.How many neutrons are present in element ?
2.What is the formula of the ions formed by the element C?
3.Which of the following pair of elements are isotopes?
(a) A and C (b) A and B
(c) C and D (d) Band D
4.Which of the following species forms an uninegative ion?​

Answer 1

Answer:

3- a as it has same at no but different at mass

1- atomic mass - 2(atomic no.) = no. of neutron

Answer 2

Answer:

1 : no. of neutrons = mass no. - atomic no.

i.e., no.of neutrons are : A=6, B=7, C=8 and D=10.

2 : C - Oxygen(2,6)

i.e., the formula of it's ion is O²⁻.

3 : Isotopes are the elements with same atomic no. but different atomic mass.

i.e., (a) A and C.

4 : Uninegative ions are formed when an element gains one electron to attain the octet.

i.e., D 9 19

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