Question

what are all the radio active elements​

Answer 1

Answer:

The Radioactive Elements (1935-2019)

The Radioactive Elements (1935-2019)1935-1944: technetium, francium, astatine, neptunium, plutonium, americium, curium.

The Radioactive Elements (1935-2019)1935-1944: technetium, francium, astatine, neptunium, plutonium, americium, curium.1945-1954: promethium, berkelium, californium, einsteinium, fermium.

The Radioactive Elements (1935-2019)1935-1944: technetium, francium, astatine, neptunium, plutonium, americium, curium.1945-1954: promethium, berkelium, californium, einsteinium, fermium.1955-1964: mendelevium, nobelium, rutherfordium.

The Radioactive Elements (1935-2019)1935-1944: technetium, francium, astatine, neptunium, plutonium, americium, curium.1945-1954: promethium, berkelium, californium, einsteinium, fermium.1955-1964: mendelevium, nobelium, rutherfordium.1965-1974: dubnium, seaborgium, lawrencium.

The Radioactive Elements (1935-2019)1935-1944: technetium, francium, astatine, neptunium, plutonium, americium, curium.1945-1954: promethium, berkelium, californium, einsteinium, fermium.1955-1964: mendelevium, nobelium, rutherfordium.1965-1974: dubnium, seaborgium, lawrencium.1975-1984: bohrium, meitnerium, hassium

Explanation:

There are 38 radioactive elements. They either have no stable naturally occurring isotope, or else are entirely artificial as all artificial elements have no stable isotopes.

Answer 2

$\huge\sf\fbox\blue{ANSWER}$

This is a list or table of elements that are radioactive. Keep in mind, all elements can have radioactive isotopes. If enough neutrons are added to an atom, it becomes unstable and decays. A good example of this is tritium, a radioactive isotope of hydrogen naturally present at extremely low levels. This table contains the elements that have no stable isotopes. Each element is followed by the most stable known isotope and its half-life.