Question

the automic number of an element indicates?​

Answer 1

Answer

Atomic number is the number of protons in the nucleus. Since this also determines the number of electrons a neutral atom has, the atomic number indicates the chemical element. In other words, all atoms with the same atomic number are the same chemical element.

The atomic mass is, generally speaking, the sum of neutrons and protons in the nucleus. Neutrons work via the weak nuclear force to hold the nucleus together against the electrostatic repulsion of the positively charged protons - the more protons a nucleus contains, the more neutrons are necessary to keep it stable. Different numbers of neutrons and the same number of protons is what we mean by isotopes of an element.

When the number of neutrons is right then the nucleus is “stable,” which mostly means that it won’t decay if you leave it alone, or at least it won’t decay very quickly. There are some elements where all isotopes are so unstable (no amount of neutrons is close enough to right) that no naturally occurring atoms exist because they decay too quickly. Technetium (atomic weight 43, atomic mass 98, half life 400ky) is the lightest element like that.

Answer 2

protons

The term atomic number, conventionally denoted by the symbol Z, indicates number of protons present in the nucleus of an atom, which is also equal to the number of electrons in an uncharged atom. The number of neutrons is represented by the neutron number (N)

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