they have not been decided yet
istopes have different numbers of neutrons and most of their elements have several istopes
deuterium and tritium.
by their mass numbers.
istopes
neutrons
istopes
Yes, they are isotopes of helium
neutrons
Examples: francium-223 or Fr-223.
Same number of protons; identical or very similar chemical properties.
Aluminum is an uncountable noun and as such has no plural. * Businesses that sell various aluminum products may refer to them as "Aluminums" in the business or trade name.
Aluminum brakes may be purchased from home improvement stores or hardware stores. Some machine shops and garages may also sell aluminum brakes. Installation may be offered, depending of the outlet. Aluminum brakes can also be bought online, with free online instructions on installation.