35 POINTS An atom of an element has 54 protons. Some of the element’s atoms have 77 neutrons.

Others have 79 neutrons.

What is the mass number for the atom that has 77 neutrons?
What element is this? (Write the full name of the element.)
How many electrons does this element have?
What is its atomic number?
What is the mass number for the atom that has 79 neutrons?
What element is this? (Write the full name of the element.)
How many electrons does it have?
What is its atomic number?

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.