Question

Arrange the five atoms- 42Ca, 39K, 44Sc, 37Ar, and 43Ti in order of:

Increasing Mass (Smallest mass first)

Increasing number of electrons (smallest number of electrons first)

Decreasing number of neutrons (Largest number of neutrons first)

Decreasing number of protons (Largest number of protons first)

Answer 1

1. 42Ca:

protons= 20

electrons= 20

neutrons= 22

2. 39K

protons= 19

electrons= 19

neutrons= 20

3. 44Sr:

protons= 21

electrons= 21

neutrons= 23

4. 37Ar:

protons= 18

electrons= 18

neutrons= 19

5. 43Ti:

protons= 22

electrons= 22

neutrons= 21

Hence,

1. Increasing mass (Protons+Neutrons)- Ar < K < Ca < Ti < Sc

2. Increasing number of electrons- Ar < K < Ca < Sc < Ti

3. Decreasing number of protons- Ti < Sc < Ca < K < Ar

4. Decreasing number of neutrons- Sr > Ca > Ti > K > Ar

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