Answer:
Indium
Step-by-step explanation:
- Elements are pure substances that can not be broken down into smaller particles using chemical means.
- They are made up of atoms that contains sub-atomic particles protons, neutrons and electrons.
- The number of protons and electrons in a neutral atom of an element are equal.
- Neutrons and protons are found in the nucleus of an atom.
- Different elements have different number of protons and neutrons.
- An element with an atom that has 42 protons and 49 neutrons in its nucleus is Indium.