Isotopes

both the atomic number and the atomic mass remain the same.

Yes, but they have varying amounts of neutrons.

The most common isotope of uranium is uranium-238.

The elements that are radioactive in their most common form are radon, technetium, potassium, and uranium. The most obvious use for radon is the automobile industry. Potassium has both medical and agribusiness uses. Uranium is commonly used as a basic fuel for nuclear reactors. Technetium is used in nuclear medicine and industries

An isotope can be produced if a nucleus gains a neutron or if one of the protons in its nucleus decays into a neutron and positron.

well its flippin simple losers

No, potassium-40 is a radioactive isotope of potassium. It undergoes radioactive decay with a half-life of about 1.25 billion years, emitting beta particles in the process.

To be an isotope stable, the number of neutrons should not exceed 1.5 times than protons.

The most abundant isotope of arsenic is arsenic-75.

If the isotope existed, it would have 16 neutrons.

An electron orbital describes in terms of quantum mechanics the position of each electron around the atomic nucleus, and an energy level is associated with each orbital. The orbitals are grouped in shells and sub-shells, and the energy levels are affected by more than one quantum parameter so the picture gets complicated for atoms with many electrons. If you want to follow this up, try the link below.

Hydrogen isotopes.

1) Protium (H-1)

has 1 proton and one electron

2)Deuterium (H-2)

Has one proton, one electron and 1 neutron.

3)Tritium (H-3)

has 1 proton, one electron and 2 neutrons

Ionization energy and electron affinity for cations and anions, respectively.

Ar 40 is the most common isotope, accounting for 99.6% of the total (by weight).

The name of the element and the mass number (number of protons + neutrons)

it is written e.g Uranium-235 or symbolically 235U

Thorium, radium, radon, polonium, thallium, etc.

The radioactive isotope is disintegrated in time and emit radiations.

The number of Neutrons in an isotope will always be different.

The number of protons must be the same.

Yes, it is true.

The half life of technetium-99 is 2,111.10e+5 years.
Avoid a confusion between Tc-99 and Tc-99m.

The one you are thinking of is probably the trefoil symbol, three black foils on a yellow background. See link below

• in reactors: yellowcake, a uranium oxide; after that probably metallic uranium
• in stars: ordinary hydrogen; after that helium