Chapter 4, Problem 100A

Interpretation Introduction

Interpretation: The contribution given by Henry Moseley’s to the modern understanding of the atom needs to be explained.

Concept Introduction: An atom is the smallest unit of matter. Atoms combine to form the elements and compounds with a simple whole-number ratio. An atom contains protons and neutrons in its nucleus and electrons move around the nucleus.

Answer to Problem 100A

The atomic number term is explained by Henry Moseley’s with the help of atom. Each and every element contain atoms with different number of protons, neutron and electrons.

Explanation of Solution

Henry Moseley’s define the arrangements of elements in periodic table according to increasing atomic number. The atomic number is the total number of protons present in an atom of an element. In neutral atoms, the number of protons and number of electrons are equal.

Conclusion

The fact that the atomic number is equal to the number of protons was Henry Moseley’s contribution to the modern understanding of the atom.