Question

how is an atom represented ??​

Answer 1

Explanation:

An atom consists of a tiny nucleus made up of protons and neutrons, on the order of 20,000 times smaller than the size of the atom. ... The mass number is the sum of the numbers of neutrons and protons in the nucleus.

Answer 2

Answer:

Elements are represented by a chemical symbol, with the atomic number and mass number sometimes affixed as indicated below. The mass number is the sum of the numbers of neutrons and protons in the nucleus.

Explanation:

The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element.