Question

A) Which is true about stable isotopes? (1 point)
Isotopes with a large difference in neutrons and protons are always stable.
Isotopes are always unstable because they are radioactive.
A stable nucleus has a similar number of protons and neutrons.
Isotopes that are naturally occurring in nature are always unstable.
A) Which atomic property is the current periodic table of the elements based? This was first proposed
by Henry Mosley. (1 point)
atomic number
nucleus size
electric charge
atomic weight

Answer 1

A) The true statement about stable isotopes is: **A stable nucleus has a similar number of protons and neutrons.** While this is generally true, it is important to note that not all isotopes with a similar ratio are stable; however, a significant number of stable isotopes do have a balance of protons and neutrons.

B) The atomic property on which the current periodic table of the elements is based, as first proposed by Henry Moseley, is: **atomic number.** Moseley's work established that the atomic number corresponds to the number of protons in an atom's nucleus, leading to the modern arrangement of the periodic table.