Question

define the following terms 1.atom. 2.isotope. 3.atomic number. 4.atomic mass number. 5.moderator in nuceal reactors

Answer 1

the smallest part into which an element can be divided

An isotope is a form of a chemical element whose atomic nucleus contains a specific number of neutron s, in addition to the number of proton s that uniquely defines the element. The nuclei of most atom s contain neutrons as well as protons.


the number of protons that a chemical element has in its centre


The mass number (symbol A, from the German word Atomgewichte (atomicweight), also called atomic mass number or nucleon number, is the totalnumber of protons and neutrons (together known as nucleons) in anatomic nucleus.

In nuclear engineering, a neutronmoderator is a medium that reduces the speed of fast neutrons, thereby turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving uranium-235 or a similar fissile nuclide.

it helps you dear
make it Brien list answer

Answer 2

Hey buddy here are your answers.

1. Atom: An atom is the smallest constituent hiiiiunit of ordinary matter that has the properties of a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms.

2. Isotope: Isotopes are atoms of the same element having the same numbers of protons, but different numbers of neutrons. They have same chemical properties due to the same electron configuration, but different physical properties.

3. Atomic number: The number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.

4. Atomic mass number: The mass number (symbol A, from the German word Atomgewichte (atomicweight), also called atomic mass number or nucleon number, is the totalnumber of protons and neutrons (together known as nucleons) in anatomic nucleus.

5. Moderator in nuceal reactors: The moderator, which is of importance in thermal reactors, is used to moderate, that is, to slow down, neutrons from fission to thermal energies. ... Commonly usedmoderators include regular (light) water (roughly 75% of the world'sreactors), solid graphite (20% ofreactors) and heavy water (5% ofreactors).


I hope it will help you.
Please mark it as brainliest.