An atom is made up of protons and neutrons (both found in the nucleus) and electro (irl the surrounding electron cloud), The atomic number i$ erupt to th e bomber of pr The mass number is equal to the plumber protons plus neutirons, in a neutral atom . number of protons equals tho number of electrons. The charge on an ion indicates ( ,moalance between protons and electrons. Too many electrons produc .-marge. too positive charge. 'hls structure Carl be wriitern as part of a chemical symbol.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.