which of the following must be the same in atoms of the same element? (ex: all atoms of silver)

question 1 options:

number of neutrons

atomic number

charge

number of protons

number of electrons

atomic mass

question 2 -
i analyze one atom of carbon in a rock and then one atom of carbon from one of my skin cells. explain the differences i might see in these two carbon atoms.

1) Atoms of a particular element must have the same number of protons but can have different numbers of neutrons. When an element has different variants that, while all having the same number of protons, have differing numbers of neutrons, these variants are called isotopes.

Explanation:

2)The element carbon is a part of seawater, the atmosphere, rocks such as limestone and coal, soils, as well as all living things. ... Through the process of photosynthesis, carbon dioxide is pulled from the air to produce food made from carbon for plant growth. Carbon moves from plants to animals.

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.